Abstract
A 75-yr-old man presented to the operating room for a right ventricular (RV) mass excision and tricuspid valve (TV) replacement. The patient reported progressive worsening of dyspnea on exertion associated with lower extremity swelling, abdominal distension, diarrhea, and several episodes of hallucinations. The preoperative evaluation and workup revealed the presence of a carcinoid tumor of the mesentery. This was supported by elevated liver function tests and a urine 5hydroxyindole-acetic acid level of 78.9 (normal 0–10 mg/24 h) as well as elevated serum serotonin level of 1050 ng/mL (normal 90–195 ng/mL). Computed tomography of the abdomen and pelvis demonstrated a 3.2 cm × 2.3 cm mesenteric soft tissue mass in the right lower quadrant.
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