Obstetrics and Gynecology

1046 questions

Question 861Question →

A 23-year-old nulligravid woman presents to the emergency department with a 3-day history of progressively worsening lower abdominal pain, high fever, and nausea. Her temperature is 39.2°C (102.6°F), blood pressure is 112/72 mmHg, and pulse is 114/min. Abdominal examination reveals marked bilateral lower quadrant tenderness with voluntary guarding. Arrange the following steps in the most appropriate sequence for the evaluation and management of this patient's suspected complicated pelvic inflammatory disease.

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Answer

The correct clinical sequence is to first perform a pelvic examination, followed by a transvaginal ultrasound, hospital admission for intravenous antibiotics, a 48 to 72-hour period of clinical observation, and finally, image-guided drainage if medical therapy fails.
The proper sequence for managing a patient with suspected complicated PID begins with a thorough clinical assessment (pelvic exam), followed by imaging (ultrasound) to confirm a TOA. Because the patient is highly febrile and symptomatic, she requires inpatient admission for IV antibiotics. Medical management is monitored for 48 to 72 hours, and invasive drainage is strictly reserved for those who do not respond to this initial antimicrobial trial.

Step-by-Step Solution

1
Perform the physical and pelvic examination.
Identifies localized signs of infection (cervical motion tenderness, adnexal tenderness) and possible mass.
Clinical diagnosis of PID requires physical examination findings to justify further targeted testing.
2
Obtain a transvaginal ultrasound.
Confirms the presence or absence of a tubo-ovarian abscess (TOA).
Imaging is necessary in severe presentations to identify complications like a TOA, which dictates the need for inpatient versus outpatient care.
3
Initiate intravenous antibiotics in an inpatient setting.
Provides immediate broad-spectrum coverage.
Severe PID or TOA necessitates inpatient intravenous therapy rather than oral outpatient therapy.
4
Reassess the patient after 48 to 72 hours.
Determines the efficacy of the empiric medical management.
A trial of medical management is successful in a majority of TOA cases, avoiding unnecessary invasive procedures.
5
Perform image-guided drainage.
Removes the source of infection.
Drainage is indicated only if the patient demonstrates persistent fever, worsening pain, or an enlarging mass despite an adequate trial of intravenous antibiotics.

Key Concept

Evaluation and step-wise escalation of management for complicated Pelvic Inflammatory Disease (Tubo-ovarian abscess)
Estimated Time:1m 30s
Question 862Question →

A healthy 26-year-old primigravida presents to the clinic for her first obstetric evaluation at 8 weeks of gestation. Vital signs are within normal limits, with a blood pressure of 108/68 mm Hg, a heart rate of 76/min, and a body mass index (BMI) of 23 kg/m 2^2. Her medical history is unremarkable. During the consultation, she expresses curiosity about the timeline of the physical and internal changes her body will undergo in the coming months. The physician explains the expected progression of normal maternal physiological adaptations. Arrange the following physiological and anatomical milestones of a normal pregnancy in the correct chronological sequence of their occurrence or peak, from earliest in gestation to latest.

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Answer

The correct chronological sequence from earliest to latest is: 1) Peak maternal serum human chorionic gonadotropin (hCG) concentration, 2) Nadir of maternal systemic vascular resistance and diastolic blood pressure, 3) Maximum physiological hemodilution and peak plasma volume expansion, 4) Engagement of the fetal head into the true pelvis.
Normal maternal physiological adaptations follow a predictable clinical timeline. The hCG level peaks first in the late first trimester (10-12 weeks) to support the corpus luteum. In the mid-second trimester (around 24 weeks), progesterone-induced vasodilation leads to a nadir in systemic vascular resistance and blood pressure. By the late second to early third trimester (28-32 weeks), the disproportionate expansion of plasma volume relative to red blood cell mass causes peak physiological hemodilution (anemia of pregnancy). Finally, in primigravidas, the fetal head engages into the maternal pelvis near term (36-38 weeks) in preparation for labor.

Step-by-Step Solution

1
Determine the timing of the peak hCG concentration.
10 to 12 weeks of gestation.
Human chorionic gonadotropin (hCG) is produced by the syncytiotrophoblast to maintain the corpus luteum in early pregnancy, with levels peaking in the late first trimester.
2
Determine the timing of the blood pressure nadir.
Around 24 weeks of gestation.
Progesterone causes profound smooth muscle relaxation and systemic vasodilation, leading to a steady decrease in blood pressure that reaches its nadir in the mid-second trimester.
3
Determine the timing of maximum physiological hemodilution.
28 to 32 weeks of gestation.
Although maternal red blood cell mass increases, plasma volume expands disproportionately (by up to 50%), resulting in the lowest physiological hematocrit during the late second to early third trimester.
4
Determine the timing of fetal head engagement.
36 to 38 weeks of gestation.
In primigravidas, the fetal presenting part descends into the maternal true pelvis several weeks prior to the onset of active labor, a process commonly known as lightening.

Key Concept

Timeline of normal maternal physiological adaptations
Question 863Question →

Seeking medical advice for the absence of her menstrual periods over the past eight months, an unmarried twenty-six-year-old nulligravida arrives at the outpatient clinic. Her prior menstrual cycles occurred regularly every thirty days. She reports feeling profoundly fatigued and has noticed a 55-kg (1111-lb) weight gain over the past year despite maintaining her usual diet. Recently, she began experiencing intermittent morning headaches.

Vital signs are blood pressure 108/70108/70 mm Hg, pulse 5656/min, and BMI 2727 kg/m 2^2. Physical examination shows delayed relaxation of the deep tendon reflexes and bilateral galactorrhea upon breast expression. There is no facial hirsutism or acne. A point-of-care urine pregnancy test is negative.

Laboratory studies reveal the following:

Laboratory TestResultReference Range
Thyrotropin (TSH)0.20.2 μ\muU/mL0.4−4.00.4-4.0 μ\muU/mL
Free tetraiodothyronine (T4)0.50.5 ng/dL0.9−2.40.9-2.4 ng/dL
Prolactin9292 ng/mL<25< 25 ng/mL
Follicle-stimulating hormone33 mIU/mL5−205-20 mIU/mL (follicular)

Which of the following is the most appropriate next step in the management of this patient?

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Answer: Cranial magnetic resonance imaging

Answer

Cranial magnetic resonance imaging is the most appropriate next step to evaluate for a sellar mass causing pituitary stalk compression.
The correct action is to perform cranial magnetic resonance imaging. This patient presents with secondary amenorrhea, galactorrhea, and clinical features of hypothyroidism (bradycardia, weight gain, delayed reflexes, fatigue). Crucially, her laboratory panel reveals central hypothyroidism (low free T4 with an inappropriately low TSH) and hypogonadotropic hypogonadism (low/normal FSH despite amenorrhea), coupled with a mild elevation in prolactin (9292 ng/mL). This specific constellation is highly characteristic of the 'stalk effect' caused by a sellar or suprasellar mass (such as a nonfunctioning pituitary adenoma or craniopharyngioma). The mass compresses the pituitary stalk, disrupting the downward transport of dopamine from the hypothalamus. Because dopamine normally inhibits prolactin release, this disruption leads to hyperprolactinemia (typically <150< 150 ng/mL, whereas true prolactinomas often secrete >200> 200 ng/mL). The physical compression of the anterior pituitary simultaneously impairs the release of TSH and gonadotropins (FSH/LH), resulting in hypothyroidism and amenorrhea. An MRI of the brain is the mandatory next step to visualize the mass and determine the extent of compression before any hormonal replacement or surgical intervention is attempted.

Step-by-Step Solution

1
Evaluate the initial presentation and primary workup.
The patient has secondary amenorrhea, galactorrhea, and symptoms of hypothyroidism, with a negative urine beta-hCG test excluding pregnancy.
Pregnancy is the most common cause of secondary amenorrhea and must always be ruled out first.
2
Interpret the laboratory findings.
The patient has low free T4 with inappropriately low TSH (central hypothyroidism), low/normal FSH (hypogonadotropic hypogonadism), and mild hyperprolactinemia.
Differentiating primary from central endocrine failure dictates the anatomical location of the pathology.
3
Deduce the underlying pathophysiology.
A mass lesion is likely compressing the pituitary stalk, blocking inhibitory dopamine from reaching lactotrophs (causing galactorrhea) while physically compressing thyrotrophs and gonadotrophs (causing amenorrhea and hypothyroidism).
This specific combination of deficiencies and mild prolactin elevation is the classic hallmark of the 'stalk effect'.
4
Select the appropriate diagnostic action.
Cranial magnetic resonance imaging is selected.
Imaging is required to identify the size, exact location, and nature of the suspected mass before medical or surgical intervention.

Key Concept

Secondary amenorrhea with central hypothyroidism and mild hyperprolactinemia strongly suggests a pituitary or suprasellar mass causing stalk compression, requiring MRI of the brain for definitive diagnosis.
Question 864Question →

A gravida 1 para 0 at 39 weeks and 5 days of gestation is admitted to the labor and delivery unit in active labor. Her prenatal course was uncomplicated. Her temperature is 37.1°C (98.8°F), blood pressure is 122/78 mm Hg, and pulse is 88/min. The estimated fetal weight is 3,200 g (7 lb 1 oz). Cervical examination shows 6 cm dilation, 90% effacement, and 0 station. Spontaneous rupture of membranes occurred 3 hours ago, revealing clear amniotic fluid. Uterine contractions are occurring every 3 to 4 minutes and palpate as strong. Continuous external fetal monitoring demonstrates a baseline heart rate of 145/min with moderate variability. There are recurrent, abrupt decreases in the fetal heart rate to 90/min that last for 45 to 60 seconds before rapidly returning to baseline; these decreases occur with almost every contraction. Maternal repositioning to the left lateral decubitus position and administration of an intravenous fluid bolus were performed 15 minutes ago, but the fetal heart rate pattern remains unchanged. Which of the following is the most appropriate next step in management?

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Answer: Initiation of transcervical amnioinfusion

Answer

Initiation of transcervical amnioinfusion
The patient's fetal heart rate tracing demonstrates recurrent variable decelerations, characterized by abrupt decreases in the fetal heart rate that coincide with contractions. These are typically caused by umbilical cord compression, which is common after the rupture of membranes due to the loss of cushioning amniotic fluid. Initial management includes maternal repositioning (to shift the fetus off the cord) and fluid administration. Because these initial measures have failed, the next best step is transcervical amnioinfusion. Amnioinfusion involves instilling isotonic fluid into the uterine cavity via an intrauterine pressure catheter to artificially restore the amniotic fluid volume, thereby relieving cord compression and reducing the frequency and severity of variable decelerations.

Step-by-Step Solution

1
Interpret the fetal heart rate tracing based on the provided description.
The tracing shows recurrent variable decelerations (abrupt decreases in heart rate associated with contractions) with a normal baseline and moderate variability.
Accurate interpretation of the fetal heart rate tracing is required to determine the underlying pathophysiology, which in this case is umbilical cord compression.
2
Evaluate the patient's response to initial interventions.
Initial intrauterine resuscitation (maternal repositioning and fluid bolus) has already been attempted but failed to resolve the decelerations.
Management of Category II tracings follows a stepwise escalation protocol.
3
Select the next appropriate therapeutic intervention.
Amnioinfusion is indicated to restore amniotic fluid volume and cushion the umbilical cord.
Since the cervix is not fully dilated (precluding vaginal delivery) and the tracing still has moderate variability (reassuring acid-base status), an amnioinfusion is the safest and most effective next step to prevent progression to fetal acidemia.

Key Concept

Management of recurrent variable decelerations using amnioinfusion
Question 865Question →

A 48-year-old female presents to the gynecology clinic reporting a 3-month history of postcoital bleeding and foul-smelling vaginal discharge. She has not received regular medical care or cancer screening for over a decade. Pelvic examination reveals a 5-centimeter friable, exophytic mass replacing the cervix and extending into the upper third of the vaginal wall. There is nodularity in the bilateral parametria on rectovaginal examination. Arrange the following steps in the correct chronological order for the optimal diagnosis, staging, and definitive management of this patient's condition.

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Answer

The correct sequence of management for locally advanced cervical cancer begins with a direct tissue biopsy of the visible lesion, followed by advanced imaging (PET-CT) for clinical staging. Treatment is then initiated with concurrent chemoradiotherapy, and concludes with targeted intracavitary brachytherapy.
The correct chronological approach to a grossly visible, symptomatic cervical mass involves first obtaining a definitive histologic diagnosis through direct punch biopsy. Once cancer is confirmed, the next mandatory step is comprehensive staging with PET-CT to evaluate the extent of local spread and assess for lymph node involvement. Because clinical examination reveals parametrial and vaginal involvement (indicating locally advanced disease), primary surgical intervention such as a radical hysterectomy is strictly contraindicated due to the inability to achieve clear margins and the high risk of severe morbidity. Instead, the patient must undergo primary concurrent chemoradiation (external beam radiation with cisplatin) to treat the extensive pelvic disease. The final step in the treatment pathway is intracavitary brachytherapy, which provides a highly targeted radiation boost to the remaining central cervical tumor to maximize local control.

Step-by-Step Solution

1
Obtain definitive tissue diagnosis
Direct punch biopsy of the cervical mass confirms invasive squamous cell carcinoma.
Grossly visible lesions must be biopsied directly; cervical cytology is a screening tool that can yield false negatives in the presence of necrotic tumor debris.
2
Determine clinical extent of disease
PET-CT evaluates for lymphatic spread and distant metastases to establish the clinical stage.
Clinical staging dictates the treatment modality. The clinical exam already suggests parametrial and vaginal involvement, which shifts the paradigm away from primary surgery.
3
Initiate primary definitive therapy
Concurrent chemoradiation is administered.
External beam radiation combined with a radiosensitizing agent (cisplatin) effectively treats the primary pelvic tumor bed and sterilizes regional lymph nodes without the severe morbidity of aggressive surgery in advanced disease.
4
Deliver targeted radiation boost
Intracavitary brachytherapy is performed.
Brachytherapy maximizes the radiation dose to the central tumor while utilizing the inverse square law to spare adjacent critical structures like the bladder and rectum.

Key Concept

Diagnostic and therapeutic sequencing for locally advanced cervical carcinoma
Estimated Time:1m 30s
Question 866Question →

An otherwise healthy 26-year-old woman presents to the ambulatory care center complaining of pelvic pain and abnormal vaginal discharge that began 3 days ago. She describes the pain as a dull, continuous ache in her lower abdomen that worsens with intercourse. She denies any nausea, vomiting, or subjective fever. Her medical history is unremarkable, and she has been using a levonorgestrel-releasing intrauterine device for contraception over the past two years. Her last menstrual period was three weeks ago. She reports having a new male sexual partner as of two months ago. Vital signs show a temperature of 37.6 C (99.7 F), blood pressure of 112/74 mm Hg, and a heart rate of 84/min. Abdominal palpation elicits mild tenderness in the bilateral lower quadrants but no rebound tenderness or guarding. On pelvic examination, the intrauterine device strings are visible at the cervical os. Purulent material is seen exuding from the endocervical canal. Bimanual examination demonstrates pronounced cervical motion tenderness and bilateral adnexal tenderness without discrete masses. A urine pregnancy test is negative. Which of the following is the most appropriate next step in management?

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Answer: Administer intramuscular ceftriaxone, oral doxycycline, and oral metronidazole; leave the intrauterine device in place

Answer

The most appropriate management is to administer outpatient antibiotics consisting of intramuscular ceftriaxone, oral doxycycline, and oral metronidazole, and to leave the intrauterine device in place.
This patient presents with classic signs of acute pelvic inflammatory disease (PID), including pelvic pain, purulent cervical discharge, cervical motion tenderness, and adnexal tenderness. Because she has mild-to-moderate symptoms without high fever, intractable vomiting, or evidence of a tubo-ovarian abscess, she can be safely managed in the outpatient setting. The recommended outpatient regimen consists of a single dose of intramuscular ceftriaxone plus a 14-day course of oral doxycycline and oral metronidazole. Importantly, in women who have an intrauterine device (IUD) in place, the device does not need to be removed initially. Standard practice is to leave the IUD in place, initiate empiric antibiotics, and reevaluate the patient in 48-72 hours. IUD removal is only considered if there is no clinical improvement after 2 to 3 days of appropriate antibiotic therapy.

Step-by-Step Solution

1
Analyze the patient's symptoms and examination findings to establish a diagnosis.
The presence of lower abdominal pain, purulent cervical discharge, cervical motion tenderness, and adnexal tenderness confirms a clinical diagnosis of pelvic inflammatory disease (PID).
Identifying the clinical syndrome dictates the treatment pathway.
2
Evaluate the severity of the infection to determine the appropriate treatment setting.
The patient lacks criteria for inpatient admission (no high fever, intractable nausea/vomiting, or palpable adnexal mass), making her a candidate for outpatient management with ceftriaxone, doxycycline, and metronidazole.
Triage between inpatient and outpatient care is essential for appropriate resource utilization and patient safety.
3
Determine the management of the intrauterine device (IUD) in the setting of acute PID.
Current guidelines dictate that the IUD should be left in place during initial antibiotic therapy.
Removing the IUD does not improve short-term clinical outcomes but prematurely removes an effective form of contraception.

Key Concept

In patients with mild-to-moderate pelvic inflammatory disease and an intrauterine device (IUD) in place, the standard of care is to initiate outpatient empiric antibiotics and leave the IUD in place, reevaluating the patient's clinical response in 48 to 72 hours.
Estimated Time:1m 0s
Question 867Question →

A 32-year-old woman, gravida 3, para 2, at 36 weeks gestation is evaluated in the clinic for a routine prenatal visit. Her pregnancy has been uncomplicated. While lying flat on the examination table for fundal height measurement, she suddenly complains of dizziness, nausea, and shortness of breath. She appears pale and diaphoretic. Her blood pressure is 82/50 mm Hg, and her heart rate is 115/min. Upon rolling onto her left side, her symptoms resolve within a few minutes. Her repeat blood pressure is 112/70 mm Hg with a heart rate of 82/min. Which of the following is the most likely mechanism responsible for this patient's initial presentation?

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Answer: Decreased venous return to the right atrium

Answer

Decreased venous return to the right atrium
The correct answer accurately identifies the pathophysiology of supine hypotensive syndrome. In the third trimester (e.g., 36 weeks), the gravid uterus becomes large and heavy enough to physically compress the inferior vena cava (IVC) against the maternal spine when the patient lies flat on her back. This mechanical compression acts as a bottleneck, significantly reducing venous return to the right atrium (preload). Because cardiac output is heavily dependent on preload, the blood pressure plummets, causing cerebral hypoperfusion (dizziness, nausea, pallor). The body responds appropriately with a sympathetic reflex tachycardia (heart rate of 115/min) to try and maintain cardiac output. Rolling the patient onto her left side relieves the mechanical compression on the IVC, rapidly restoring venous return and normalizing her hemodynamics.

Step-by-Step Solution

1
Analyze the clinical presentation and vital signs.
The patient develops acute hypotension, compensatory tachycardia, and presyncopal symptoms exclusively while in the supine position.
Identifying the positional nature of the symptoms is the key to differentiating this from other causes of hypotension in pregnancy.
2
Determine the anatomical and physiological changes at 36 weeks gestation in the supine position.
The heavy gravid uterus mechanically compresses the inferior vena cava (IVC) against the vertebral column.
Understanding the physical relationship between the third-trimester uterus and major abdominal vessels explains the hemodynamic shifts.
3
Connect the mechanical compression to the hemodynamic consequences.
IVC compression impedes blood flow from the lower extremities back to the heart, severely reducing preload (venous return to the right atrium).
A sudden drop in preload leads to a proportional drop in cardiac output and blood pressure, triggering the symptoms of supine hypotensive syndrome.

Key Concept

Supine hypotensive syndrome occurs in late pregnancy when the gravid uterus mechanically compresses the inferior vena cava in the supine position, severely reducing venous return to the right atrium (preload) and consequently lowering cardiac output.
Question 868Question →

Review the following patient clinical histories and epidemiological profiles. Identify the specific gynecologic malignancy that each patient is at the highest statistical risk of developing.

Click a left item, then click its matching right item

Items

A 23-year-old female whose mother was prescribed diethylstilbestrol during her first trimester of pregnancy to prevent miscarriage.
A 78-year-old female with a long-standing history of intense vulvar pruritus, tissue fragility, and parchment-like labial skin changes.
A 28-year-old female who recently underwent suction curettage for a 46,XX pregnancy characterized entirely by hydropic chorionic villi.
A 62-year-old female with a body mass index of 42 kg/m2, type 2 diabetes mellitus, and a lifelong history of oligomenorrhea.

Matches

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Answer

Diethylstilbestrol exposure links to clear cell vaginal cancer; lichen sclerosus links to vulvar squamous cell carcinoma; a complete mole links to choriocarcinoma; and unopposed estrogen from obesity and anovulation links to endometrioid uterine cancer.
Each clinical presentation features a highly specific historical or pathological precursor that directly aligns with a distinct gynecologic malignancy, testing the fundamental epidemiological associations required for disease screening and recognition.

Step-by-Step Solution

1
Analyze the teratogenic exposure history.
In utero diethylstilbestrol is identified.
This is a direct, pathognomonic cause of clear cell vaginal adenocarcinoma.
2
Evaluate the chronic vulvar dermatosis in the elderly patient.
The parchment-like changes indicate lichen sclerosus.
Lichen sclerosus is the primary non-HPV pathway to vulvar squamous cell carcinoma.
3
Identify the type of molar pregnancy.
A 46,XX molar pregnancy with only hydropic villi is a complete mole.
Complete moles have the highest risk of malignant transformation to gestational choriocarcinoma.
4
Assess the metabolic and menstrual history of the 62-year-old.
Obesity and oligomenorrhea indicate prolonged unopposed estrogen exposure.
Unopposed estrogen drives endometrial hyperplasia, leading directly to endometrioid adenocarcinoma.

Key Concept

Epidemiological risk factors and precursor lesions for specific gynecologic malignancies.
Estimated Time:1m 30s
Question 869Question →

A 56-year-old woman, gravida 2, para 2, comes to the office due to a 1-month history of intermittent vaginal spotting and new-onset breast tenderness. Her last menstrual period was 5 years ago. She has no significant past medical history and takes no medications. Vital signs are within normal limits. Body mass index is 23 kg/m223 \text{ kg/m}^2. Pelvic examination reveals normal external genitalia and vagina. The cervix appears grossly normal. Bimanual examination is notable for an 8 cm8 \text{ cm}, mobile, non-tender right adnexal mass. The uterus is of normal size and mobility. Transvaginal ultrasound demonstrates an 8.5 cm8.5 \text{ cm} complex, multiloculated solid and cystic right ovarian mass. The endometrial stripe thickness is 14 mm14 \text{ mm}. Which of the following is the most appropriate next step in management?

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Answer: Endometrial biopsy

Answer

Endometrial biopsy
The correct answer is to perform an endometrial biopsy. This patient's clinical picture is classic for a granulosa cell tumor. These sex cord-stromal ovarian tumors secrete high levels of estrogen. In a postmenopausal woman, this unopposed estrogenic stimulation leads to breast tenderness and endometrial proliferation (evidenced by the postmenopausal bleeding and a highly abnormal 14 mm14 \text{ mm} endometrial stripe). Because 10%10\% to 15%15\% of women with granulosa cell tumors have concomitant endometrial adenocarcinoma, an endometrial biopsy is mandatory. Establishing this diagnosis preoperatively is essential because it significantly alters the surgical plan; a patient with concurrent endometrial cancer will require comprehensive surgical staging (including lymph node dissection) rather than just removal of the uterus and adnexa.

Step-by-Step Solution

1
Analyze the clinical presentation.
The patient has postmenopausal bleeding, a complex right adnexal mass, breast tenderness, and a thickened endometrial stripe (14 mm14 \text{ mm}).
Identifying the combination of symptoms points toward a unifying diagnosis rather than isolated findings.
2
Identify the likely underlying pathology.
The combination of a solid/cystic ovarian mass with signs of hyperestrogenism (breast tenderness, endometrial proliferation) strongly suggests a granulosa cell tumor of the ovary.
Granulosa cell tumors are sex cord-stromal tumors that classically secrete estradiol.
3
Determine the secondary risks of the pathology.
Unopposed estrogen secretion leads to continuous endometrial stimulation. Up to 15% of patients with granulosa cell tumors have concurrent endometrial carcinoma.
The presence of a 14 mm14 \text{ mm} stripe in a postmenopausal woman (normal is ≤4 mm\le 4 \text{ mm}) indicates abnormal proliferation.
4
Select the most appropriate immediate next step.
An office-based endometrial biopsy must be performed prior to definitive surgical management.
Knowing if concurrent endometrial cancer is present is critical because it dictates the need for comprehensive surgical staging (e.g., pelvic and para-aortic lymphadenectomy) during the exploratory laparotomy.

Key Concept

Patients with suspected estrogen-secreting ovarian tumors (e.g., granulosa cell tumors) who present with a thickened endometrial stripe or abnormal uterine bleeding must undergo an endometrial biopsy to rule out concurrent endometrial hyperplasia or carcinoma prior to definitive surgery.
Question 870Question →

A 26-year-old woman, G1P0, at 40 weeks and 2 days gestation, is currently in the active phase of the first stage of labor. Cervical examination reveals 7 cm dilation, complete effacement, and +1 station. Spontaneous rupture of membranes occurred four hours ago, revealing clear fluid. The patient is receiving an epidural for analgesia and an intravenous oxytocin drip to optimize uterine contractility. Maternal vital signs are within normal limits. The continuous fetal monitor shows a baseline heart rate of 142/min with moderate variability. The tracing also reveals gradual, symmetric drops in the fetal heart rate that consistently start after the peak of each uterine contraction, with the lowest point of the drop occurring after the contraction resolves. These drops are observed with more than half of the contractions. Which of the following is the most appropriate next action in the care of this patient?

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Answer: Cessation of the intravenous oxytocin infusion

Answer

Cessation of the intravenous oxytocin infusion
The patient's fetal heart rate tracing demonstrates recurrent late decelerations, which are defined as gradual, symmetric decreases in the fetal heart rate that begin after the peak of a contraction and reach their nadir after the contraction has ended. Late decelerations are a sign of uteroplacental insufficiency. When they occur in more than 50% of contractions, they require immediate intervention. The initial management consists of intrauterine resuscitation measures aimed at improving placental blood flow and fetal oxygenation. These measures include maternal repositioning (typically left lateral decubitus), administering an intravenous fluid bolus, providing supplemental oxygen, and immediately discontinuing any uterotonic agents. Because this patient is receiving an oxytocin infusion, which stimulates uterine contractions and temporarily decreases blood flow to the intervillous space, stopping the oxytocin is the most critical and appropriate next action.

Step-by-Step Solution

1
Interpret the fetal heart rate (FHR) tracing described in the clinical vignette.
The FHR tracing shows recurrent late decelerations (gradual decreases starting after the contraction peak).
Accurate interpretation of the FHR pattern is essential to determine the underlying pathophysiology and guide management.
2
Determine the pathophysiologic cause of the FHR pattern.
Late decelerations are caused by uteroplacental insufficiency, which can be exacerbated by uterine contractions, especially when augmented by oxytocin.
Understanding that uterine contractions temporarily decrease placental blood flow explains why modifying contraction frequency or intensity is therapeutic.
3
Select the most appropriate initial management step for this condition.
The first step in intrauterine resuscitation is to alleviate uteroplacental insufficiency by stopping uterotonic agents like oxytocin, repositioning the mother, and administering intravenous fluids or oxygen.
Stopping oxytocin immediately reduces the frequency and strength of contractions, restoring placental blood flow and improving fetal oxygenation without prematurely resorting to surgical delivery.

Key Concept

Recurrent late decelerations indicate uteroplacental insufficiency and should be initially managed with intrauterine resuscitation, starting with the discontinuation of any uterotonic agents like oxytocin.
Question 871Question →

Routine cervical cancer screening is performed on a 44-year-old patient during her annual health maintenance visit. The patient has a medical history significant for type 2 diabetes mellitus and a body mass index of 33 kg/m233 \text{ kg/m}^2. She reports that her menstrual cycles occur every 28 days and last for 5 days with moderate flow. She has two children delivered vaginally at term. The laboratory reports the cytology results as atypical glandular cells. Speculum examination reveals a parous cervix with no visible lesions. Bimanual examination demonstrates a normal-sized, mobile uterus and no adnexal tenderness. Which of the following is the most appropriate next step in the management of this patient?

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Answer: Colposcopy, endocervical sampling, and endometrial sampling

Answer

Colposcopy, endocervical sampling, and endometrial sampling
The most appropriate next step in management is colposcopy, endocervical sampling, and endometrial sampling. Atypical glandular cells (AGC) on cervical cytology present a high risk of significant underlying pathology, including cervical adenocarcinoma in situ, invasive cervical adenocarcinoma, and endometrial adenocarcinoma. Because of this risk, all women age 35 and older with AGC must undergo a thorough evaluation of both the cervix and the endometrium. Furthermore, this patient's history of obesity and type 2 diabetes mellitus places her at even higher baseline risk for endometrial neoplasia.

Step-by-Step Solution

1
Interpret the cervical cytology result.
The cytology shows atypical glandular cells (AGC), which carry a higher risk of significant underlying pathology (cervical or endometrial) compared to atypical squamous cells.
AGC can originate from the endocervix or the endometrium, and differentiating the source is critical for appropriate management.
2
Assess the patient's demographic and clinical risk factors.
The patient is 44 years old, which is above the threshold of 35 years. She also has additional risk factors for endometrial cancer, including obesity and type 2 diabetes mellitus.
Age and specific risk factors dictate whether an endometrial evaluation must be added to the standard cervical evaluation.
3
Determine the guideline-concordant next step in management.
The standard of care is to perform colposcopy with endocervical sampling and endometrial sampling.
Current guidelines require this comprehensive tissue sampling for all women age 35 and older with AGC to adequately evaluate for both cervical and endometrial neoplasia.

Key Concept

Management of Atypical Glandular Cells (AGC) on cervical cytology
Estimated Time:1m 0s
Question 872Question →

An uncomplicated pregnant patient presents for evaluation at 2828 weeks of gestation for her scheduled obstetric follow-up. The 2525-year-old nulliparous woman reports feeling well, with only mild generalized fatigue and occasional lower back pain. She explicitly denies abdominal pain, nausea, vomiting, or skin itchiness. Her blood pressure is 112/70112/70 mm Hg, and her pulse is 8282/min. Physical examination reveals a gravid uterus consistent with dates and no right upper quadrant tenderness. The skin shows no excoriations or jaundice.

Routine laboratory results are as follows:

Hemoglobin: 11.211.2 g/dLg/dL
Platelet count: 195,000/μL195,000/\mu L
Aspartate aminotransferase (AST): 2424 U/LU/L
Alanine aminotransferase (ALT): 2828 U/LU/L
Alkaline phosphatase: 285285 U/LU/L (Reference: 40−12040-120 U/LU/L)
Total bilirubin: 0.60.6 mg/dLmg/dL

Which of the following is the most appropriate next step in the management of this patient?

Show answer & explanation

Answer: Continue routine prenatal care

Answer

Continue routine prenatal care
The correct answer is to continue routine prenatal care. This patient has an isolated elevation of alkaline phosphatase (ALP) in the setting of an otherwise normal clinical presentation and normal aminotransferases (AST, ALT) and bilirubin. During pregnancy, total ALP levels naturally increase, often reaching 2 to 4 times the non-pregnant upper limit of normal by the third trimester. This is primarily due to the production of a placental isoenzyme of ALP, alongside a minor contribution from increased maternal bone turnover. Because this patient is asymptomatic (e.g., no right upper quadrant pain, no pruritus) and her other liver biochemical tests are strictly within normal limits, this finding represents a benign, physiologic change of pregnancy. No further diagnostic testing or treatment is required.

Step-by-Step Solution

1
Evaluate the patient's symptoms and physical examination findings.
The patient is asymptomatic (no pruritus, no abdominal pain) with a normal physical examination.
To determine if there is any clinical evidence of true liver or biliary pathology.
2
Analyze the laboratory results in the context of the third trimester of pregnancy.
AST, ALT, and bilirubin are normal. Alkaline phosphatase is significantly elevated.
To differentiate between normal physiologic adaptations of pregnancy and pathological hepatic disease.
3
Synthesize findings to determine the next step in management.
The isolated elevated alkaline phosphatase is a normal physiologic finding due to placental production. No further workup is needed.
To avoid unnecessary testing or treatment for a normal physiologic adaptation.

Key Concept

During pregnancy, an isolated elevation in alkaline phosphatase (ALP) is a normal physiologic change caused by the placental production of the ALP isoenzyme and increased maternal bone turnover. In the absence of symptoms or other liver function abnormalities, it requires no intervention.
Question 873Question →

A 15-year-old girl is brought to the clinic by her parents due to the absence of menarche. She reports no cyclical lower abdominal pain. A urine beta-hCG test obtained in the clinic is negative. Her height is at the 5th percentile for her age, and her weight is at the 40th percentile. Vital signs are within normal limits. Physical examination reveals Tanner stage 1 breast development and Tanner stage 1 pubic hair. She has a broad chest with widely spaced nipples and a low posterior hairline. Arrange the following diagnostic steps in the most appropriate sequential order to evaluate and manage this patient's condition.

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Answer

The correct sequence is: 1) pelvic ultrasonography, 2) serum FSH measurement, 3) karyotype analysis, 4) transthoracic echocardiogram.
The diagnostic evaluation for primary amenorrhea follows a rigid stepwise algorithm. After ruling out pregnancy (beta-hCG is negative), the first step is a pelvic ultrasound to confirm the presence of a uterus. If the uterus is present and the patient lacks secondary sexual characteristics (Tanner stage 1 breasts), serum FSH is measured next to distinguish between hypergonadotropic hypogonadism (ovarian failure) and hypogonadotropic hypogonadism (central defect). In a patient with short stature, a broad chest, and low hairline, the FSH will be elevated. The next step is a karyotype analysis to definitively diagnose Turner syndrome (45,X). Upon confirming Turner syndrome, a transthoracic echocardiogram must be obtained to screen for associated cardiovascular defects, such as a bicuspid aortic valve or coarctation of the aorta.

Step-by-Step Solution

1
Confirm the presence of reproductive anatomy
Perform a pelvic ultrasonography
In primary amenorrhea, identifying whether Mullerian structures (the uterus) are present determines the correct diagnostic branch of the algorithmic pathway.
2
Differentiate central versus peripheral hypogonadism
Measure serum FSH level
With a uterus present and absent breast development, an FSH level determines if the cause is primary ovarian failure (high FSH) or a hypothalamic/pituitary defect (low/normal FSH).
3
Diagnose the specific genetic etiology
Perform a karyotype analysis
An elevated FSH confirms hypergonadotropic hypogonadism. In a patient with short stature and specific physical stigmata, a karyotype provides the definitive diagnosis of Turner syndrome.
4
Screen for life-threatening comorbidities
Obtain a transthoracic echocardiogram
Once Turner syndrome is diagnosed, immediate screening for highly prevalent and potentially fatal cardiovascular defects is required.

Key Concept

Stepwise evaluation and management of primary amenorrhea
Question 874Question →

A 2626-year-old woman, gravida 11, para 00, presents to the obstetrics clinic to establish prenatal care. Her vital signs are within normal limits, and her medical history is unremarkable. She reports irregular menstrual cycles and is uncertain of her last menstrual period. Her physician explains how pregnancy progression is tracked using early ultrasound findings followed by standardized physical examination landmarks. Arrange the following expected clinical and sonographic milestones for this patient in the correct chronological sequence from the earliest gestational age to the latest.

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Answer

The correct sequence of pregnancy landmarks from earliest to latest is: Gestational sac visible on transvaginal ultrasound, followed by Fetal cardiac activity visible on ultrasound, then Uterine fundus palpable at the pubic symphysis, then Uterine fundus at the umbilicus, and finally Uterine fundus at the xiphoid process.
Gestational age can be reliably estimated clinically and sonographically using a standardized sequence of landmarks. Transvaginal ultrasound visualizes the gestational sac earliest, at around 4.54.5 to 55 weeks. Embryonic cardiac activity becomes visible soon after at approximately 66 weeks. As the pregnancy progresses, the uterus grows out of the pelvis, becoming palpable abdominally just above the pubic symphysis at 1212 weeks. By mid-pregnancy at 2020 weeks, the fundus reaches the level of the umbilicus. Finally, the fundus reaches its maximum vertical height at the xiphoid process around 3636 weeks of gestation.

Step-by-Step Solution

1
Identify the earliest sonographic sign of pregnancy.
The gestational sac becomes visible on transvaginal ultrasound at approximately 4.54.5 to 55 weeks.
This is the first structural evidence of an intrauterine pregnancy, appearing prior to the yolk sac and fetal pole.
2
Determine when embryonic cardiac motion begins.
Fetal cardiac activity is typically visualized on transvaginal ultrasound by 66 weeks of gestation.
Cardiac motion follows the appearance of the fetal pole and is a critical milestone for confirming early pregnancy viability.
3
Identify when the expanding uterus becomes an abdominal organ.
The uterine fundus is palpable just above the pubic symphysis at 1212 weeks of gestation.
Prior to 1212 weeks, the uterus remains entirely within the pelvis and is typically not palpable on abdominal examination.
4
Locate the standard mid-pregnancy physical examination landmark.
The uterine fundus reaches the level of the umbilicus at 2020 weeks of gestation.
This is a highly reliable clinical marker. Between 2020 and 3636 weeks, the fundal height in centimeters approximately correlates with the gestational age in weeks.
5
Identify the maximum superior height of the uterine fundus.
The fundus reaches the xiphoid process at approximately 3636 weeks of gestation.
This represents the peak vertical height before 'lightening' occurs, which is when the fetal head descends into the maternal pelvis in the final weeks just prior to delivery.

Key Concept

Chronological timeline of normal anatomic and sonographic landmarks used to monitor progression and estimate gestational age in pregnancy.
Question 875Question →

Match each clinical and laboratory profile of a patient presenting with primary amenorrhea to the most likely underlying diagnosis.

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Items

Profile 1: 16-year-old with primary amenorrhea, absent breast development, and absent pubic hair. Pelvic ultrasound reveals a small uterus. Blood pressure is 155/95 mmHg, and serum potassium is 2.9 mEq/L. Labs show elevated FSH and LH.
Profile 2: 16-year-old with primary amenorrhea, normal breast development, and absent axillary and pubic hair. Pelvic ultrasound reveals an absent uterus. Labs show testosterone in the normal adult male range and elevated LH.
Profile 3: 16-year-old with primary amenorrhea, normal breast development, and normal pubic hair. Pelvic ultrasound reveals an absent uterus and normal ovaries. Labs show normal female levels of testosterone, FSH, and LH.
Profile 4: 15-year-old with primary amenorrhea, absent breast development, and normal pubic hair. She has a history of cleft lip repair and cannot distinguish the smell of coffee. Pelvic ultrasound reveals a normal uterus. Labs show low FSH and LH.
Profile 5: 16-year-old with primary amenorrhea, absent breast development, and normal pubic hair. She is at the 3rd percentile for height. Pelvic ultrasound reveals a small uterus and streak ovaries. Labs show markedly elevated FSH and LH.

Matches

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Answer

Profile 1 matches 17-alpha-hydroxylase deficiency; Profile 2 matches Complete androgen insensitivity syndrome (CAIS); Profile 3 matches Müllerian agenesis; Profile 4 matches Kallmann syndrome; Profile 5 matches Gonadal dysgenesis (Turner syndrome).
The diagnosis of primary amenorrhea relies on evaluating breast development (estrogen presence), pubic hair (androgen presence), pelvic ultrasound (Müllerian structures), and FSH/LH levels. Profile 1's unique triad of absent sex steroids, hypertension, and hypokalemia defines 17-alpha-hydroxylase deficiency. Profile 2's absent pubic hair despite male-level testosterone points to androgen insensitivity. Profile 3's entirely normal female phenotype minus a uterus is classic Müllerian agenesis. Profile 4's hypogonadotropic hypogonadism with anosmia is Kallmann syndrome. Profile 5's hypergonadotropic hypogonadism with short stature and normal adrenarche defines Turner syndrome.

Step-by-Step Solution

1
Evaluate Profile 1 for presence of uterus and secondary sexual characteristics.
Uterus is present, breasts and pubic hair are absent, indicating a lack of both estrogens and androgens. Concomitant hypertension and hypokalemia point to a steroidogenesis defect.
17-alpha-hydroxylase deficiency shunts steroid precursors to mineralocorticoids, causing hypertension and hypokalemia, while preventing synthesis of sex steroids.
2
Evaluate Profile 2 for presence of uterus and secondary sexual characteristics.
Absent uterus, normal breasts, absent pubic hair, and male-range testosterone indicate a 46,XY disorder of sex development with androgen resistance.
In CAIS, tissues cannot respond to androgens (no pubic hair), but normal aromatization of high testosterone levels produces enough estrogen for breast development.
3
Evaluate Profile 3 for presence of uterus and secondary sexual characteristics.
Absent uterus but completely normal secondary sexual characteristics and female hormones indicate a structural anomaly.
Müllerian agenesis involves the failed development of the uterus and upper vagina, but the ovaries (which dictate hormones and secondary characteristics) are unaffected.
4
Evaluate Profile 4 for hormone levels and associated anomalies.
Low FSH/LH with anosmia and cleft lip indicates a central defect.
Kallmann syndrome is caused by the failure of GnRH-secreting neurons to migrate, often accompanied by anosmia and midline defects.
5
Evaluate Profile 5 for hormone levels, secondary characteristics, and physical stigmata.
Elevated FSH/LH with absent breasts but normal pubic hair, combined with short stature, indicates primary ovarian insufficiency with normal adrenal function.
Turner syndrome (45,X) causes accelerated follicular atresia leading to streak ovaries (lack of estrogen) and short stature, but adrenal androgens (responsible for pubic hair) are spared.

Key Concept

Differential diagnosis of primary amenorrhea using the presence or absence of secondary sexual characteristics, the uterus, and corresponding endocrine profiles.
Question 876Question →

A 29-year-old woman, who delivered a healthy infant four weeks ago, is evaluated for sudden-onset fever, chills, and left-sided breast pain. She has been exclusively breastfeeding since delivery. Her temperature is 38.4∘38.4^\circ C (101.1∘101.1^\circ F), blood pressure is 112/70112/70 mm Hg, and pulse is 9898/min. Physical examination of the left breast reveals a focal, wedge-shaped area of erythema, warmth, and induration in the upper outer quadrant that is markedly tender to palpation. There is no palpable fluctuance, skin retraction, or purulent nipple discharge. The right breast is unremarkable. Which of the following is the most appropriate next step in management?

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Answer: Initiate an oral antistaphylococcal antibiotic and encourage continued breastfeeding

Answer

Initiate an oral antistaphylococcal antibiotic and encourage continued breastfeeding
This patient's presentation of fever, focal breast erythema, warmth, and tenderness in the setting of lactation is highly characteristic of lactational mastitis. The most common causative organism is Staphylococcus aureus, which typically enters the breast tissue through microabrasions in the nipple. The standard of care is empiric oral antibiotic therapy targeting methicillin-susceptible S. aureus (such as dicloxacillin or cephalexin) combined with continuous, frequent milk drainage. Stopping breastfeeding is explicitly contraindicated, as inadequate breast emptying leads to milk stasis, which can exacerbate the infection and lead to abscess formation.

Step-by-Step Solution

1
Analyze the patient's symptoms and physical exam findings.
The patient has fever, chills, and focal breast erythema/tenderness four weeks postpartum without any fluctuant mass.
These findings are classic for lactational mastitis, a localized soft tissue infection of the breast.
2
Identify the standard management for the suspected diagnosis.
Management includes systemic antibiotics to treat the underlying bacterial infection (usually Staphylococcus aureus) and continuous milk drainage.
Antibiotics are required due to systemic symptoms, and continuous breastfeeding prevents milk stasis, which is the primary driver of abscess formation.

Key Concept

Uncomplicated lactational mastitis is managed clinically with oral antistaphylococcal antibiotics (e.g., dicloxacillin, cephalexin) and the continuation of frequent milk drainage (via breastfeeding or pumping) to prevent progression to a breast abscess.
Question 877Question →

For her annual well-woman examination, a twenty-seven-year-old female is evaluated in the ambulatory care center. She is seeking advice on initiating a highly reliable form of birth control, having recently entered a new sexual relationship. Her medical background is notable for polycystic ovary syndrome (PCOS), currently managed solely through lifestyle modifications, with menses occurring unpredictably every 6 to 8 weeks. Additionally, eight weeks ago, she developed an unprovoked right lower extremity deep vein thrombosis (DVT) and is presently anticoagulated with oral apixaban. Her vital signs are within normal limits, though her body mass index is 31.5 kg/m². A bimanual pelvic exam demonstrates a normal-sized, mobile uterus with no adnexal masses. A urine pregnancy test is negative. In light of her complex medical history, which of the following represents the optimal choice for preventing pregnancy in this individual?

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Answer: Levonorgestrel-releasing intrauterine device

Answer

The correct answer is the levonorgestrel-releasing intrauterine device.
The levonorgestrel-releasing intrauterine device is the optimal choice because it safely provides highly effective contraception (MEC Category 2 for DVT), delivers local progestin to protect the endometrium from hyperplasia (crucial for PCOS), and significantly decreases menstrual blood loss, mitigating the bleeding risks associated with active apixaban therapy.

Step-by-Step Solution

1
Assess the absolute contraindications based on the patient's acute DVT.
Estrogen-containing methods (Combined OCPs) are US MEC Category 4 and must be excluded.
Estrogen increases the synthesis of clotting factors, unacceptably raising the risk of recurrent VTE.
2
Identify the patient's need for endometrial protection due to PCOS.
The patient requires a progestin-containing method to prevent endometrial hyperplasia from chronic anovulation.
The copper IUD is non-hormonal and does not protect the endometrium against unopposed estrogen, making it inappropriate for this patient.
3
Evaluate the remaining progestin-only options in the context of active apixaban use and obesity.
The levonorgestrel-releasing IUD is selected over the subdermal implant and depot medroxyprogesterone acetate (DMPA).
The LNG-IUD reliably decreases menstrual bleeding (offsetting the bleeding risk of apixaban) and avoids the metabolic derangements and weight gain heavily associated with DMPA, making it the most optimal choice.

Key Concept

Selection of contraception requires synthesizing multiple medical conditions using the US Medical Eligibility Criteria (MEC); in patients with a history of DVT, estrogen is contraindicated, while concurrent PCOS mandates endometrial protection with a progestin.
Question 878Question →

Match each patient's clinical presentation to the most likely underlying breast disorder.

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Items

A 22-year-old woman with a firm, well-circumscribed, highly mobile, and rubbery breast mass
A 35-year-old woman with spontaneous, unilateral, bloody nipple discharge without a palpable mass
A 40-year-old woman with a firm breast mass, localized pain, and overlying ecchymosis one month after severe blunt trauma
A 28-year-old breastfeeding woman presenting with sudden-onset unilateral breast pain, localized erythema, and a fever of 38.8°C (101.8°F)

Matches

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Answer

The presentations map to their classic diagnoses: the mobile rubbery mass is a fibroadenoma, the isolated bloody nipple discharge is an intraductal papilloma, the post-trauma mass with ecchymosis is fat necrosis, and the febrile breastfeeding presentation is lactational mastitis.
Each clinical scenario describes the classic, hallmark features of a specific benign breast disorder. Recognizing these pathognomonic presentations is essential for differentiating them from malignant processes, directing the appropriate initial diagnostic imaging (such as ultrasound for young women), and providing patient reassurance.

Step-by-Step Solution

1
Analyze the presentation of the 22-year-old woman with a mobile, rubbery mass.
This matches the classic physical examination findings of a fibroadenoma.
The patient's young age and the mass's mobile, well-circumscribed characteristics are pathognomonic for this benign stromal tumor.
2
Evaluate the 35-year-old woman with unilateral bloody nipple discharge.
This is identified as an intraductal papilloma.
Spontaneous, bloody, unilateral discharge without a mass is the hallmark presentation of an intraductal papilloma.
3
Assess the 40-year-old woman with a breast mass and ecchymosis following trauma.
This presentation is consistent with fat necrosis.
A clear history of trauma preceding the development of a mass and ecchymosis strongly points to fat necrosis rather than a malignancy.
4
Review the 28-year-old breastfeeding woman with fever and localized breast erythema.
This is diagnostic of lactational mastitis.
The combination of active lactation, focal breast inflammation, and systemic febrile symptoms indicates a bacterial infection of the breast tissue.

Key Concept

Classic clinical presentations of benign breast disorders
Question 879Question →

A 29-year-old woman, gravida 1, para 0, at 40 weeks gestation is admitted to the labor and delivery unit in spontaneous labor. Her pregnancy has been uncomplicated. Four hours after admission, her cervical examination reveals 6 cm dilation, 90% effacement, and -1 station. She is currently receiving an intravenous oxytocin infusion for labor augmentation due to inadequate cervical progression. Her temperature is 37.1°C (98.8°F), blood pressure is 120/78 mm Hg, and pulse is 88/min. Continuous fetal monitoring shows a baseline heart rate of 145/min with moderate variability. Over the last 30 minutes, there is an average of 7 contractions in a 10-minute window. The fetal heart rate tracing demonstrates symmetric, gradual decreases in the fetal heart rate that begin after the peak of the contraction and return to baseline after the contraction ends. These decelerations are occurring with nearly every contraction. Which of the following is the most appropriate next step in management?

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Answer: Discontinue the intravenous oxytocin

Answer

Discontinue the intravenous oxytocin
The correct intervention is to discontinue the intravenous oxytocin. The patient's presentation of 7 contractions in a 10-minute window indicates uterine tachysystole. The associated gradual decreases in fetal heart rate that begin after the contraction peak are late decelerations, which occur due to uteroplacental insufficiency. The excessive frequency of contractions restricts blood flow to the intervillous space, causing transient fetal hypoxemia. The initial step in intrauterine resuscitation for tachysystole is to discontinue any uterotonic agents. Other immediate measures include maternal repositioning (left lateral decubitus), administering an intravenous fluid bolus, and providing supplemental oxygen.

Step-by-Step Solution

1
Analyze the contraction pattern described in the fetal heart rate tracing.
The tracing shows 7 contractions in a 10-minute window, which meets the definition for uterine tachysystole (abnormally frequent contractions, defined as >5 contractions in 10 minutes averaged over 30 minutes).
Identifying abnormal uterine activity is crucial because it can compromise blood flow to the intervillous space.
2
Interpret the type of fetal heart rate decelerations occurring.
The decelerations are described as symmetric and gradual, beginning after the peak of the contraction and returning to baseline after the contraction ends. This is the classic description of late decelerations.
Late decelerations signify uteroplacental insufficiency and transient fetal hypoxemia.
3
Synthesize the findings to determine the next best step in management.
The patient has uteroplacental insufficiency driven by oxytocin-induced uterine tachysystole. The immediate intervention required is intrauterine resuscitation by discontinuing the oxytocin infusion.
Stopping the uterotonic agent is the most direct way to reduce contraction frequency, thereby restoring placental perfusion and improving fetal oxygenation.

Key Concept

The initial management of recurrent late decelerations caused by oxytocin-induced uterine tachysystole is discontinuation of the oxytocin infusion.
Question 880Question →

A 44-year-old woman presents to the emergency department on postoperative day 8 following an uncomplicated total abdominal hysterectomy for symptomatic adenomyosis. She reports a 2-day history of worsening lower abdominal pain, severe chills, and foul-smelling vaginal discharge. Her temperature is 39.2°C (102.6°F), blood pressure is 102/68 mm Hg, heart rate is 112/min, and respiratory rate is 18/min. Physical examination reveals localized lower abdominal tenderness with guarding and purulent discharge pooling at the vaginal cuff. Arrange the following management steps in the most appropriate chronological sequence for this patient.

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Answer

The correct sequence of management is to first obtain cultures, immediately followed by the initiation of broad-spectrum antibiotics, then obtain a CT scan of the abdomen and pelvis, and finally perform percutaneous image-guided drainage.
The patient's clinical presentation of high fever, tachycardia, and localized abdominal pain on postoperative day 8 following a hysterectomy is highly suspicious for a post-operative pelvic abscess or infected pelvic hematoma. In any post-operative patient exhibiting signs of early sepsis, the standard chronological algorithm prioritizes immediate medical stabilization before advanced diagnostic imaging and interventional procedures. The crucial first step is to obtain blood and local cultures to guide definitive therapy. Immediately after cultures are drawn, broad-spectrum intravenous antibiotics and fluid resuscitation must be administered; delaying antibiotics to wait for a CT scan scanner increases morbidity. Once the patient is receiving medical therapy, a contrast-enhanced CT scan of the abdomen and pelvis is indicated to localize the infectious source and rule out collateral injuries (such as bowel or urinary tract damage). Finally, definitive source control is achieved through percutaneous image-guided drainage of the identified collection, which carries much lower morbidity than an emergency exploratory laparotomy.

Step-by-Step Solution

1
Assess for sepsis and obtain microbiological cultures.
Peripheral blood, urine, and local vaginal vault cultures are secured.
Cultures must be drawn prior to the administration of antibiotics to avoid sterilizing the samples, which would prevent the transition to targeted, pathogen-specific therapy later.
2
Administer intravenous antibiotics and fluids.
Empiric treatment for suspected post-operative pelvic sepsis begins.
Early antibiotic therapy significantly reduces mortality in septic patients and should not be delayed by waiting for diagnostic imaging.
3
Obtain cross-sectional diagnostic imaging.
A contrast-enhanced CT scan of the abdomen and pelvis visualizes and localizes a pelvic abscess.
Imaging is the most sensitive modality to differentiate a pelvic abscess from an infected hematoma, vault cellulitis, or other post-operative complications, and is necessary for surgical planning.
4
Perform definitive source control.
The infected fluid collection is mechanically evacuated.
Antibiotics alone are insufficient for treating large loculated abscesses; image-guided percutaneous drainage is the standard of care for definitive resolution.

Key Concept

The management of post-operative pelvic sepsis follows a strict clinical algorithm: immediate collection of diagnostic cultures, prompt initiation of empiric antibiotics and fluids, cross-sectional imaging for precise localization, and finally mechanical source control.
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