NCIt definition : A rare, low-grade malignant sex cord-stromal tumor that arises from the testis in
adults. It is composed of granulosa cells in an often fibrothecomatous stroma. Several
morphologic patterns have been identified and include insular, gyriform, trabecular,
pseudosarcomatous, and solid. Gynecomastia is present in approximately a quarter of
the patients. Metastases have been reported in a minority of patients.;