Sertoli-Leydig cell tumor of the ovary with teratomatous differentiation: clinicopathologic considerations.

A patient with recurrent Sertoli-Leydig cell tumor is described. The light and ultrastructural findings are illustrated. The tumor recurred first as a poorly differentiated tumor with rhabdomyoblastic differentiation. Following chemotherapy the next recurrence exhibited well differentiated Sertoli-Leydig cell elements. These findings may reflect the capability of this tumor type to undergo chemotherapeutic transformation similar to the transformation which has been described in germ cell tumors of the ovary and testis. This observation may be of importance in the clinical management of patients with poorly differentiated Sertoli-Leydig cell tumors.