Abstract
Granulosa cell tumor is almost exclusively an ovarian tumor. Rare cases of granulosa cell tumor have been reported involving the testes. We report a testicular gonadal stromal tumor with granulosa cell differentiation in a 54-year-old white man. The tumor was discovered by an ultrasound evaluation for left hydrocele. The patient was clinically asymptomatic. On frozen section, the initial impression was a malignant lymphoma. Final histology on the orchiectomy specimen showed a gonadal stromal tumor with granulosa cell features. Immunohistochemical studies excluded malignant lymphoma and germ cell tumors, consistent with a stromal tumor. This case report illustrates the challenges for the pathologist in making an accurate diagnosis in unusual testicular tumors.
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