Diabetes Mellitus USMLE Step 1 Practice Question
A 38-year-old woman presents with episodic pounding headaches, diaphoresis, and palpitations triggered during abdominal surgery. Vital signs show BP 188/112 mmHg, HR 118/min, RR 20/min, temperature 37.2°C, and SpO2 98% on room air. She denies chest pain. Laboratory studies reveal elevated 24-hour urinary fractionated metanephrines (640 pg/mL, normal <90). Abdominal CT imaging demonstrates a 3-cm left adrenal mass. Which tumor is most likely responsible for her presentation?
Answer choices
- AParathyroid chief cell adenoma
- BThyroid follicular adenoma
- CChromaffin cell tumor of the adrenal medullaCorrect answer
- DCorticotroph adenoma of the pituitary
- EAldosterone producing adrenal cortical adenoma
- FParaganglioma from hereditary SDHB mutation
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