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A 52-year-old woman is brought to the emergency department reporting the abrupt onset of an excruciating headache, which she describes as "the worst of my life." The pain began $10$ hours ago and is accompanied by photophobia, severe nausea, and a stiff neck. Her vital signs are stable, and a detailed neurologic examination reveals no focal motor or sensory deficits. A stepwise diagnostic workup for a suspected subarachnoid hemorrhage (SAH) is initiated.

Arrange the following diagnostic modalities in the most appropriate sequential order for evaluating this patient, assuming each preceding step is non-diagnostic or requires further localization.

A 42-year-old man presents to the primary care clinic reporting a six-month history of progressive fatigue, joint pain, and decreased libido. The joint pain primarily affects the second and third metacarpophalangeal joints of both hands. His past medical history is unremarkable, and he takes no medications. Vital signs are within normal limits. Physical examination reveals generalized hyperpigmentation that is most prominent over sun-exposed areas and the palmar creases. Abdominal examination demonstrates a palpable, smooth liver edge 3 cm below the right costal margin. Laboratory testing shows a fasting blood glucose of 135 mg/dL, aspartate aminotransferase of 58 U/L, and alanine aminotransferase of 62 U/L. Which of the following is the most appropriate next step in laboratory evaluation?

A 76-year-old male patient arrives at the emergency department reporting excruciating, sudden-onset abdominal pain that began three hours prior to evaluation. His past medical history is notable for hypertension, type 2 diabetes mellitus, and chronic atrial fibrillation, though he admits to frequently missing doses of his oral anticoagulant. His temperature is 37.9°C (100.2°F), blood pressure is 105/65 mm Hg, pulse is 122/min and irregularly irregular, and respirations are 24/min. On physical examination, the patient appears in distress and is writhing in bed. The abdomen is mildly distended and diffusely tender, but there is no rigidity or rebound tenderness. Bowel sounds are hypoactive. Laboratory studies show a leukocyte count of 19,500/mm³ and a serum lactate level of 4.8 mmol/L. A contrast-enhanced CT scan of the abdomen and pelvis reveals a focal filling defect in the proximal superior mesenteric artery. Additional imaging findings include diminished mucosal enhancement in the distal jejunum and small, linear branching lucencies in the periphery of the liver. Based on the interpretation of these imaging findings, which of the following is the most appropriate next step in management?

A pathologist is reviewing biopsy specimens from four different patients who recently underwent neurosurgical resection of central nervous system masses. Match each specific microscopic description below with its most likely definitive pathologic diagnosis.

In the evaluation of patients presenting with undifferentiated systemic symptoms or atypical respiratory complaints, eliciting a comprehensive occupational, environmental, and dietary history is critical for narrowing the differential diagnosis. Match each patient's specific historical exposure profile to the most appropriate diagnostic consideration.

A $19$-year-old male of West African descent is admitted to the inpatient oncology unit for the initiation of induction chemotherapy after being diagnosed with bulky Burkitt lymphoma. His baseline renal function and electrolyte panels are within normal limits. Thirty-six hours after starting a cytotoxic regimen containing cyclophosphamide, doxorubicin, vincristine, and methotrexate, he reports severe nausea, muscle twitching, and significantly reduced urine output.

An electrocardiogram shows peaked T waves. Laboratory evaluation reveals the following:

The attending physician plans to prescribe a recombinant urate oxidase enzyme to rapidly lower the patient's uric acid levels. Which of the following patient factors represents an absolute contraindication to this specific pharmacologic intervention?

Match each patient's clinical presentation of amenorrhea with the most appropriate targeted laboratory test or panel to establish the diagnosis.

A 29-year-old woman is evaluated in the ambulatory care clinic for a 3-month history of missed menstrual periods and a bilateral milky breast discharge. She reports feeling generally fatigued but explicitly denies headaches, visual field deficits, or cold intolerance. Her medical history includes a poorly characterized bipolar mood disorder and refractory gastroesophageal reflux disease. Her current medications include a mood stabilizer, a proton pump inhibitor, and a new medication prescribed two months ago at an urgent care clinic for persistent postprandial nausea and bloating. Physical examination reveals normal visual fields to confrontation and bilateral expressible galactorrhea. A urine pregnancy test is negative. Laboratory studies show a normal serum thyroid-stimulating hormone (TSH) level and a markedly elevated serum prolactin level of 92 ng/mL (normal: <25 ng/mL). Which of the following historical inquiries are MOST critical to identify the underlying etiology of this patient's current laboratory abnormalities? (Select all that apply)

A 68-year-old man comes to the physician due to a 3-month history of fatigue and intermittent black, tarry stools. He has no prior medical history and takes no medications. Vital signs are within normal limits. Physical examination reveals conjunctival pallor and mild epigastric tenderness. Laboratory testing shows a hemoglobin of 9.2 g/dL. Esophagogastroduodenoscopy reveals a 4.5-cm, smooth, submucosal mass in the body of the stomach with a small area of central ulceration. Endoscopic ultrasound-guided core needle biopsy of the lesion is performed. Histopathologic examination shows intersecting fascicles of spindle cells with elongated nuclei and eosinophilic cytoplasm. Immunohistochemical staining of the biopsy specimen is strongly positive for CD117 (c-KIT) and DOG1, and negative for desmin, S-100 protein, and smooth muscle actin. Based on these histopathologic and immunohistochemical findings, which of the following is the most likely diagnosis?

Emergency medical services transport a 22-year-old woman to the hospital after her roommate found her lethargic and confused. Over the past 12 hours, she has experienced a high fever, repeated vomiting, and profuse diarrhea. Her medical history is notable for severe epistaxis, for which an anterior nasal packing was placed at an urgent care clinic three days ago. Current vital signs are temperature 39.5°C (103.1°F), blood pressure 82/45 mmHg, pulse 135/min, and respiratory rate 24/min. Physical examination reveals a diffuse, erythematous, macular rash that resembles a severe sunburn covering her trunk and extremities. Her sclerae are markedly injected, and the oral mucosa is hyperemic. The nasal packing remains in place and appears saturated. Which of the following best describes the molecular mechanism responsible for this patient's rapid hemodynamic collapse?

A 28-year-old woman comes to the clinic complaining of chronic, watery diarrhea for the past 4 months. She states she has 3 to 5 loose, large-volume bowel movements daily, accompanied by significant flatulence and abdominal bloating. The patient notes that her symptoms improve significantly when she fasts or restricts her diet. Her past medical history is unremarkable, and she takes no medications. Vital signs are within normal limits. Physical examination reveals a non-tender abdomen with hyperactive bowel sounds.

A fresh stool sample is sent for chemical and electrolyte analysis, and the results are as follows:

Measured stool osmolality: $295\text{ mOsm/kg}$
Stool sodium: $30\text{ mEq/L}$
Stool potassium: $45\text{ mEq/L}$
Stool chloride: $20\text{ mEq/L}$
Stool pH: $5.4$

Based on the laboratory results provided, what is the calculated stool osmotic gap in mOsm/kg?

A 25-year-old man comes to the primary care clinic for routine sexually transmitted infection screening. He is currently asymptomatic and has no history of genital lesions. The clinic's affiliated laboratory recently switched to the 'reverse sequence algorithm' for syphilis screening to handle high testing volumes more efficiently. Assuming the initial screening test is reactive, and the reflex test is non-reactive, arrange the following laboratory assays in the correct chronological order they would be performed to complete the diagnostic workup.

A $27$-year-old woman presents to the clinic complaining of acute-onset blurry vision in her left eye that began two days ago. She also reports mild pain in the same eye when looking in different directions. She has no significant past medical history and takes no medications. Vital signs are within normal limits. Visual acuity is $20/20$ in the right eye and $20/200$ in the left eye. During the physical examination, the physician performs a swinging flashlight test. When the light is shone directly into the right eye, both pupils constrict briskly. When the light is rapidly moved to shine into the left eye, both pupils appear to dilate. Which of the following is the most likely anatomic location of the lesion responsible for this physical examination finding?

A 48-year-old woman is brought to the emergency department after the sudden onset of an excruciating 'thunderclap' headache, photophobia, and nausea. On physical examination, her blood pressure is 160/90 mm Hg, and her heart rate is 92/min. She exhibits nuchal rigidity but no focal neurological deficits. She is subsequently diagnosed and admitted to the neurological intensive care unit. Arrange the following diagnostic neuroimaging modalities in the standard chronological sequence they should be utilized for her initial diagnosis, etiological workup, and subsequent inpatient complication monitoring.

An ambulance brings a 68-year-old male patient to the acute care unit due to altered mental status and hyperventilation that began earlier today. His wife reports that he had a severe gastrointestinal illness over the last three days with profound watery diarrhea, leading to significantly decreased oral fluid intake. His past medical history is significant for hypertension, stable angina, and type 2 diabetes mellitus. He has continued to take his prescribed daily medications despite his recent illness.

Physical examination reveals a lethargic, difficult-to-arouse patient with deep, rapid respirations. Vital signs include a blood pressure of 88/54 mm Hg, heart rate of 115/min, and respiratory rate of 28/min. The abdomen is diffusely tender but soft.

Initial laboratory evaluation shows:
- Sodium: 138 mEq/L
- Potassium: 5.2 mEq/L
- Chloride: 98 mEq/L
- Bicarbonate: 10 mEq/L
- Blood urea nitrogen: 54 mg/dL
- Creatinine: 3.2 mg/dL (baseline was 1.4 mg/dL one month ago)
- Glucose: 145 mg/dL
- Lactate: 9.5 mmol/L (Normal: 0.5 - 2.2 mmol/L)

An arterial blood gas drawn on room air demonstrates a pH of 7.22 and a pCO2 of 24 mm Hg.

The drug most likely responsible for this acute presentation lowers serum glucose primarily through which of the following cellular mechanisms?

A 42-year-old woman is evaluated in the post-anesthesia care unit 3 hours after undergoing an uncomplicated total thyroidectomy for a multinodular goiter. The nursing staff calls the physician because the patient has become highly agitated, is complaining of worsening neck fullness, and is experiencing progressive difficulty breathing. Her temperature is 37.1°C (98.8°F), blood pressure is 158/92 mm Hg, pulse is 114/min, and respiratory rate is 28/min with audible inspiratory stridor. Oxygen saturation is 92% on room air. Physical examination reveals a tense, rapidly expanding swelling deep to the anterior neck incision. Removing the outer surgical dressing exposes a taut, bulging, and bluish surgical site. Which of the following is the most appropriate next step in management?

A 55-year-old man comes to the clinic for a routine follow-up. Three months ago, he was diagnosed with primary hyperlipidemia and was started on rosuvastatin. He reports taking his medication daily and has no current complaints. He specifically denies experiencing any muscle weakness, dark urine, abdominal pain, or jaundice. Physical examination reveals no abnormalities. Routine laboratory testing shows the following results:

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

A 52-year-old man is hospitalized for a proximal right lower extremity deep vein thrombosis. He is initially managed with a continuous intravenous unfractionated heparin infusion. On admission, his laboratory evaluation was unremarkable, including a platelet count of 240,000/mm³. On day 5 of hospitalization, routine morning laboratory testing reveals a platelet count of 110,000/mm³. He reports feeling well and is hemodynamically stable. Physical examination shows no new signs of bleeding, petechiae, or expanding edema. Which of the following is the most appropriate next step in the management of this patient?

An established clinic patient with ischemic heart disease schedules a visit to discuss new-onset erectile dysfunction. He reports achieving partial erections that are insufficient for intercourse and desires pharmacological assistance. His past medical history includes a myocardial infarction three years prior, hypertension, and hyperlipidemia. His daily medication regimen consists of low-dose aspirin, lisinopril, carvedilol, atorvastatin, and isosorbide mononitrate. He specifically asks for a prescription for sildenafil. The physician explains that this medication cannot be safely prescribed due to an absolute contraindication with his current regimen. Which of the following home medications precludes the use of sildenafil in this patient?

During a routine oncology clinic visit, a 71-year-old male complains of progressive right calf pain and swelling over the past three days. He was diagnosed with advanced gastric adenocarcinoma three months ago and is currently receiving palliative chemotherapy. He has no history of recent trauma, surgery, or prolonged immobilization. His temperature is 37.1°C (98.8°F), blood pressure is 128/78 mmHg, pulse is 88/min, and respiratory rate is 14/min. Physical examination reveals an erythematous and edematous right lower leg that is tender to palpation. A lower extremity venous Doppler ultrasound confirms an acute deep venous thrombosis in the right popliteal and femoral veins. Laboratory studies show a hemoglobin of 10.2 g/dL, platelet count of 185,000/mm³, and creatinine of 1.0 mg/dL (estimated glomerular filtration rate: 72 mL/min). Which of the following is the most appropriate pharmacologic intervention for this patient's acute thrombosis?