adult type testicular granulosa cell tumor (MONDO_0004548) is a rare sex cord-stromal tumor that arises from the testis in adults. Gynecomastia is present in approximately a quarter of the patients. Several morphologic patterns have been identified and include insular, gyriform, trabecular, pseudosarcomatous, and solid. Metastases occur in approximately twenty percent of the cases. Also known as: adult testicular granulosa cell tumor, adult testicular granulosa cell tumour.