A strumal carcinoid arising in a benign cystic teratoma of the left ovary was reported in a 41 year-old woman. The solid tumor was histologically a trabecular carcinoid tumor associated intimately with thyroid follicle-like structures. By Grimelius staining, argyrophil granules were found in the cytoplasm of the tumor cells. The final diagnosis of strumal carcinoid, however, was established by the confirmation of thyroid tissue.
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