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A 43-year-old woman has numbness, weakness, and blurred vision that resolve but then recur. Brain MRI shows plaques. What is the most likely diagnosis?

A 44-year-old woman with hypertension is noted to have left ventricular hypertrophy on echocardiogram. What is the most likely pathophysiologic mechanism?

A 4-year-old child living in an older home presents with irritability, developmental delay, and microcytic anemia. What cellular mechanism is most disrupted by the suspected condition?

A 28-year-old woman with a mechanical heart valve presents for follow-up. Which test is used to evaluate her anticoagulation status?

A 46-year-old female presents with fatigue, facial swelling, and muscle weakness. Labs show low cortisol and low ACTH levels. What is the most likely diagnosis?

A 61-year-old male with a history of alcohol use presents with confusion, asterixis, and elevated serum ammonia. What is the most likely diagnosis?

A 16-year-old boy presents with proteinuria and hematuria following a streptococcal infection. What is the most likely cause?

A 64-year-old woman presents with fatigue and hematuria. Imaging reveals a renal mass. What laboratory finding is most consistent with paraneoplastic syndrome from renal cell carcinoma?

A patient with chronic obstructive pulmonary disease (COPD) is found to have elevated CO2 levels and low pH. Which acid-base disorder is most likely?

A 32-year-old man presents with burning epigastric pain that improves with eating. Urea breath test is positive. What is the most likely diagnosis?