Inflammatory Bowel Disease USMLE Step 1 Practice Question
A 60-year-old woman presents with a 3-month history of episodic facial flushing, watery diarrhea, and wheezing. Vital signs show BP 128/82 mmHg, HR 102 bpm, RR 18/min, temp 37.2°C, SpO2 98% on room air. CT abdomen reveals a 2-cm small bowel neuroendocrine tumor with multiple hepatic metastases. Serum chromogranin A is elevated at 450 ng/mL. Physical examination shows no hepatomegaly. Which substance best explains her clinical presentation?
Answer choices
- AInsulin
- BSomatostatin
- CGastrin
- DHistamine released from mast cells in the skin only
- ESerotoninCorrect answer
- FVasoactive intestinal peptide (VIP)
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