A young woman presented with acromegaly and amenorrhea-galactorrhea with hypersomatotropinemia and hyperprolactinemia. In addition, she had hypergastrinemia with abnormal secretory dynamics and evidence of a large pituitary tumor with suprasellar extension and erosion of the floor of the sella turcica. Evaluation of secretory diarrhea revealed a large abdominal tumor, which on removal was found to be a carcinoid of the jejunum. Postoperatively, the acromegaly, amenorrhea-galactorrhea, and hypergastrinemia resolved, and the pituitary returned to normal size, with regrowth of the sella floor. The carcinoid tumor was shown by immunoperoxidase staining to contain GH-releasing hormone.
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