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Match the following combinations of serum laboratory profiles to their most likely underlying pathophysiologic diagnosis. (Reference ranges: Calcium 8.4–10.2 mg/dL, Phosphorus 2.5–4.5 mg/dL, Intact PTH 10–65 pg/mL)

A 28-year-old female patient is evaluated at an outpatient clinic to establish primary care. She has no specific complaints, exercises regularly, and reports feeling well. She does not take any medications, over-the-counter supplements, or illicit substances. Her family history is notable for a father who was told he had "high blood calcium" years ago but never required surgery. Vital signs are within normal limits. Physical examination reveals a non-palpable thyroid gland and normal deep tendon reflexes.

Laboratory evaluation shows:
Serum calcium: $11.3$ mg/dL (Normal: $8.4-10.2$ mg/dL)
Serum albumin: $4.1$ g/dL (Normal: $3.5-5.0$ g/dL)
Serum phosphorus: $3.0$ mg/dL (Normal: $2.5-4.5$ mg/dL)
Intact parathyroid hormone: $58$ pg/mL (Normal: $15-65$ pg/mL)
24-hour urinary calcium: $42$ mg/24 hr (Normal: $100-300$ mg/24 hr)

Which of the following best describes the underlying molecular mechanism responsible for this patient's laboratory findings?

A $32$-year-old woman is admitted to the hospital with sudden-onset pleuritic chest pain and dyspnea. Computed tomography angiography of the chest reveals a segmental pulmonary embolism. Her medical history is significant for two spontaneous abortions, one at $12$ weeks and another at $14$ weeks of gestation. She takes no medications and has no prior history of bleeding disorders or anticoagulant use.

Initial laboratory studies reveal the following:

A mixing study is performed using equal parts of the patient's plasma and normal pooled plasma. The repeat aPTT immediately after mixing is $72\text{ seconds}$, and after a $2$-hour incubation, it remains $73\text{ seconds}$.

To further evaluate these findings, a dilute Russell viper venom time (dRVVT) test is performed and found to be significantly prolonged.

Which of the following in vitro laboratory interventions will most likely correct this patient's prolonged dRVVT?

You are the attending physician supervising a resident on the urology and nephrology consult service. Review the following patient vignettes and pair each specific scenario with the most evidence-based imaging study required to guide the next phase of management.

A 35-year-old man is hospitalized for the treatment of infective endocarditis and is currently receiving his first dose of intravenous penicillin G. Ten minutes into the infusion, he develops severe pruritus, a sensation of throat tightness, and sudden shortness of breath. His temperature is 37.1°C (98.8°F), blood pressure is 82/50 mm Hg, pulse is 122/min, and respirations are 26/min. Physical examination reveals diffuse urticaria across his torso and audible expiratory wheezing.

Arrange the following management and diagnostic steps in the most appropriate chronological order for this patient's acute condition.

Evaluate the following clinical vignettes of patients presenting with diverse manifestations of muscle weakness. Match each clinical scenario with the most specific targeted serologic laboratory test indicated to establish the diagnosis.

A 65-year-old man presents to the clinic for preoperative evaluation before an elective inguinal hernia repair. A screening posteroanterior and lateral chest radiograph reveals a 1.4-cm, well-circumscribed, non-calcified opacity in the peripheral right upper lobe. He has a 40-pack-year smoking history but quit 5 years ago. He is completely asymptomatic, reporting no cough, hemoptysis, shortness of breath, or weight loss. Physical examination is unremarkable. Arrange the following diagnostic steps in the most appropriate sequential order for the evaluation of this patient's imaging finding, from the initial action to the definitive diagnostic procedure.

A 48-year-old man is brought to the emergency department by emergency medical services after being found unresponsive in a park. His medical history is unknown. On physical examination, he is unarousable and his breath has a faint, sweet chemical odor. Vital signs show a temperature of $36.2^\circ\text{C}$ ($97.2^\circ\text{F}$), blood pressure of $110/70\text{ mm Hg}$, heart rate of $105/\text{min}$, and respiratory rate of $22/\text{min}$.

Initial laboratory studies are obtained:

Arterial blood gas testing on room air shows a pH of 7.24, $p\text{CO}_2$ of $28\text{ mm Hg}$, and $p\text{O}_2$ of $92\text{ mm Hg}$. A serum ethanol level is undetectable.

What is this patient's serum osmolal gap?

A 45-year-old man presents to the clinic with episodic, severe dizziness. He describes the sensation as the room spinning, which is often exacerbated by rapid head movements. A comprehensive neurological and vestibular physical examination is performed to differentiate between peripheral and central etiologies of his vertigo. Match the following bedside vestibular physical examination maneuvers with their corresponding diagnostic significance or classical positive finding.

A 45-year-old woman presents to the dermatology clinic for evaluation of a suspicious skin lesion on her left posterior thigh. She states that a 'mole' she has had for over a decade has recently grown larger, developed irregular borders, and acquired varied shades of brown, black, and blue. Excisional biopsy confirms malignant melanoma with a Breslow depth of 1.8 mm. The foundational pathogenesis of this disease typically follows a well-described, stepwise evolution of cellular and structural changes. Arrange the following histopathologic and cellular phases of this patient's neoplastic process in the correct chronological sequence of classical development, from the earliest initial lesion to the most advanced stage.

Evaluate the following patient occupational and exposure histories. Match each clinical presentation to the most likely toxicological diagnosis based on the critical elements of the patient's history.

During a routine continuity clinic visit, a physician evaluates a 54-year-old female patient for persistent, resistant hypertension. She was initially diagnosed with essential hypertension 5 years ago. Three months ago, due to uncontrolled readings, her medication regimen was maximized to include amlodipine 10 mg daily, olmesartan 40 mg daily, and chlorthalidone 25 mg daily. Despite confirmed adherence, her home blood pressure logs consistently show systolic values >160 mm Hg. Today, she reports new-onset generalized muscle weakness and occasional palpitations. She denies headaches, episodic diaphoresis, or chest pain. Vital signs show a blood pressure of 168/104 mm Hg and a heart rate of 78/min. Physical examination reveals normal heart sounds, clear lungs, and trace bilateral pedal edema. There are no abdominal bruits.

Laboratory studies reveal the following:
Serum sodium: 144 mEq/L
Serum potassium: 2.7 mEq/L
Serum bicarbonate: 30 mEq/L
Serum creatinine: 0.9 mg/dL
Plasma renin activity: markedly decreased
Serum aldosterone: markedly decreased

Which of the following targeted history questions is most appropriate to identify the underlying etiology of this patient's condition?

A 62-year-old man with a history of end-stage renal disease on hemodialysis presents to the emergency department with two days of sharp, positional chest pain that has now progressed to severe dyspnea and dizziness. He has missed his last two dialysis sessions. His temperature is 37.8°C (100.0°F), blood pressure is 86/70 mm Hg, pulse is 122/min, and respirations are 26/min. The patient appears anxious and uncomfortable, leaning forward in bed. His extremities are cool. An electrocardiogram reveals sinus tachycardia with low voltage QRS complexes and electrical alternans. Based on the most likely diagnosis, which of the following physical examination findings are most likely to be present in this patient? (Select all that apply)

A $59$-year-old man is evaluated in the emergency department for severe, colicky left flank pain that began $4$ hours ago. He has no significant past medical history. His temperature is $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), blood pressure is $142/85\text{ mm Hg}$, and pulse is $88\text{/min}$. Physical examination demonstrates left costovertebral angle tenderness. Urinalysis reveals $25$-$30\text{ erythrocytes/hpf}$. A non-contrast computed tomography (CT) scan of the abdomen and pelvis reveals a $4\text{-mm}$ obstructing calculus in the distal left ureter. Additionally, an incidental $4.5\text{-cm}$ cystic mass is identified in the upper pole of the right kidney. To further characterize this mass, a contrast-enhanced CT protocol is performed. The post-contrast images demonstrate that the right renal cyst contains multiple thick, irregular septations and several distinct soft-tissue mural nodules with measurable enhancement.

Based on the imaging characteristics of the right renal mass, which of the following is the most appropriate next step in management?

A physician evaluates multiple patients presenting with clinical signs of thyrotoxicosis (e.g., tachycardia, weight loss, tremor). Match the following thyroid diagnostic profiles (comprising Free T4, TSH, Radioactive Iodine Uptake [RAIU], and Thyroglobulin) with their corresponding primary pathophysiologic mechanism.

A 68-year-old man presents to the clinic reporting progressive yellowing of his skin and eyes over the past three weeks. He has noticed dark urine, pale-colored stools, and an unintentional 5-kg (11-lb) weight loss during this time. He denies any abdominal pain, fever, or chills. Physical examination is notable for scleral icterus and a palpable, non-tender mass in the right upper quadrant. Arrange the following imaging and image-guided modalities in the most appropriate standard sequence for diagnosing and staging this patient's suspected condition, starting with the initial step.

An otherwise healthy 39-year-old male is brought to the emergency department by his partner due to an acute episode of an intense, throbbing headache, palpitations, and excessive sweating. He states that the symptoms began abruptly 30 minutes ago while he was resting at home. He has experienced three similar episodes over the past two months, but they always resolved spontaneously before he could seek medical attention. He takes no prescription medications and denies illicit drug use. Vital signs reveal a blood pressure of $198/112$ mm Hg and a heart rate of $115$ /min. On physical examination, the patient is visibly diaphoretic and tremulous. Cardiopulmonary examination is otherwise normal, and there are no focal neurologic deficits. An electrocardiogram demonstrates sinus tachycardia with no ischemic changes. Which of the following is the most appropriate next step in laboratory evaluation to establish the diagnosis?

A 62-year-old retired electrician with a history of poorly controlled hypertension and tobacco use arrives at the emergency department accompanied by his spouse, reporting the sudden onset of severe dizziness, unsteadiness, and difficulty swallowing that started two hours ago. Vital signs include a blood pressure of 178/102 mm Hg, heart rate of 88/min, and respiratory rate of 16/min. The patient is alert but speaks with a hoarse voice. Neurological evaluation reveals prominent horizontal nystagmus. There is a loss of pain and temperature sensation on the right side of the face and the left side of the body. Light touch, proprioception, and vibratory sensations are intact throughout. The right eye demonstrates a mildly drooping upper eyelid and a constricted pupil. Muscle strength is 5/5 in all extremities, and deep tendon reflexes are 2+ bilaterally. Based on the localization of the current neurologic deficit, which of the following additional physical examination findings is most likely to be present in this patient?

A 65-year-old woman is evaluated in the emergency department for the sudden onset of shortness of breath and right-sided pleuritic chest pain that began two hours ago. She underwent a total right knee arthroplasty two weeks ago and has been recovering at home. Her medical history is significant for hypertension, type 2 diabetes mellitus, and chronic kidney disease stage 4, with a baseline serum creatinine of $3.2 \text{ mg/dL}$. Vital signs show a temperature of $37.2^\circ\text{C}$ ($99.0^\circ\text{F}$), blood pressure of $135/85 \text{ mmHg}$, heart rate of $112 \text{ beats/min}$, and respiratory rate of $24 \text{ breaths/min}$. Oxygen saturation is $90\%$ on room air. Physical examination reveals clear breath sounds bilaterally. Cardiac examination reveals a regular rhythm with tachycardia but no murmurs or gallops. The bilateral lower extremities are symmetric without significant edema or calf tenderness. A chest radiograph is unremarkable. Electrocardiography shows sinus tachycardia. Which of the following is the most appropriate imaging study to establish the diagnosis?

A $64$-year-old man is evaluated in the emergency department for severe right upper quadrant abdominal pain, nausea, and dark urine that began $24$ hours ago. He has a history of essential hypertension, type 2 diabetes mellitus, and profound sensorineural hearing loss for which he underwent bilateral cochlear implant placement $5$ years ago. His temperature is $37.4^\circ\text{C}$ ($99.3^\circ\text{F}$), blood pressure is $138/85 \text{ mm Hg}$, and pulse is $88\text{ /min}$. Physical examination reveals scleral icterus and tenderness to palpation in the right upper quadrant without guarding or rebound. Laboratory studies show:

Leukocyte count: $9,500\text{ /mm}^3$
Total bilirubin: $2.8 \text{ mg/dL}$
Direct bilirubin: $2.0 \text{ mg/dL}$
Alkaline phosphatase: $310 \text{ U/L}$
Aspartate aminotransferase (AST): $145 \text{ U/L}$
Alanine aminotransferase (ALT): $160 \text{ U/L}$

Right upper quadrant transabdominal ultrasound demonstrates multiple echogenic foci with posterior acoustic shadowing in the gallbladder. The common bile duct is dilated at $9 \text{ mm}$, but the distal portion is obscured by overlying bowel gas, and no ductal stones are visualized.

Which of the following is the most appropriate next step in imaging or evaluation for this patient?