Insular carcinoid of ovary associated with malignant mucinous tumors

Ovarian carcinoids are frequently encountered in association with mucinous cysts and occasionally with mucinous cystadenomas. From a series of more than 200 ovarian carcinoids, this report describes 2 cases of insular carcinoid, 1 of which arose in a cystadenoma of borderline malignancy and the other in a mucinous adenocarcinoma. Histogenesis, histologic patterns, and natural history of carcinoid are discussed.