Strumal carcinoid of the ovary

A strumal carcinoid arising in a benign cystic teratoma of the right ovary was reported in a 40-year-old woman. The solid tumor was histologically a trabecular carcinoid tumor associated intimately with thyroid follicle-like structures. By electron microscopy, spherical dense core secretory granules were found in the cytoplasm of tumor cells. Final diagnosis of strumal carcinoid, however, was established in the present tumor by the immunohistological confirmation of thyroid tissue with anti-human thyroglobulin.