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Search: Organ site Search: Tumor / Syndrome
WHO Classification of Tumours
Leydig cell tumor, malignant
Testis/Male genital organs


A Leydig cell tumor characterized by large tumor size, and the presence of cytologic atypia, increased mitotic activity, necrosis, and vascular invasion. Approximately 10% of the testicular Leydig cell tumors show malignant characteristics and metastasize.