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1021 Surgery

A 54-year-old man presents with 7 weeks of facial flushing and diarrhea. His symptoms began intermittently but are becoming more constant. A 24-hour urine collection reveals an elevated level of 5-hydroxyindoleacetic acid (5-HIAA), a metabolite of serotonin. An abdominal CT scan shows a 2-cm mesenteric mass in the ileum and likely metastatic tumors in the liver. What is the likely diagnosis?

ASerotonin syndrome
BMalignant carcinoid syndrome
CCushing syndrome
DPhaeochromocytoma
Surgery
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