A 65-year-old woman is admitted to hospital for recent decline in mental function. She has a history of weight loss. She is not currently taking any medications. Vitals and hydration status are normal. Neurologic exam shows no abnormalities. Serum biochemistry is as follows: Na+ 120 mEq/L; K+ 4.5 mEq/L; blood urea nitrogen (BUN) 15 mg/dL; creatinine 1.0 mg/dL; plasma osmolality 260 mOsmol/kg; urine osmolality 800 mOsmol/kg. What’s the most likely diagnosis?
Adrenal cortical adenoma
Adrenal medullary adenoma
Diuretic use
Gitelman syndrome
Pulmonary neoplasm
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Cut-to-the-chase Answer (0:41):
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HY USMLE Answer (4:12):
