Light micrograph of a Leydig cell tumor of the testis. The tumor is well circumscribed and contains cells with round nucleoli and small prominent nucleoli, as well as moderate amounts of eosinophilic cytoplasm. No mitoses or necrosis are identified. Tumor cells would be immunoreactive for inhibin and calretinin.
Courtesy of Dr. Michelle S. Hirsch, Department of Pathology, Brigham and Womens Hospital, Boston, MA.
