Metastatic testicular Sertoli-cell tumor: cytopathologic findings on fine-needle aspiration.

Malignant Sertoli-cell tumors of the testis are exceedingly rare. We present cytopathologic findings in pelvic metastasis of such a tumor in a 45-year-old man, diagnosed on fine-needle aspiration, 2 months after radical orchiectomy. Ultrasound-guided aspirate showed tissue fragments and isolated discohesive tumor cells with characteristics of testicular Sertoli cells. Immunoperoxidase (IPOX) studies and histopathologic correlation with the primary testicular tumor are also presented. Cytopathologic features complimented by IPOX studies should allow an accurate diagnosis of this rare entity, when seen at metastatic sites.