Primary Malignancy in a Supernumerary Testicle Presenting as a Large Pelvic Mass

Figure 5

Retroperitoneal mass, excision. Nonviable tumor with extensive hyalinization and xanthogranulomatous reaction, and epididymis (a) (H&E, ×40); testicular parenchyma with extensive tubular atrophy, Sertoli cell hyperplasia, and clusters of small seminiferous tubules with pseudostratified Sertoli cells. Some tubules show Sertoli cell-produced basement membrane-like material inside the hypoplastic tubules (b) (H&E, ×200); colonic wall adjacent to nonviable tumor showing xanthogranulomatous reaction (c); colonic mucosa with no pathologic changes (d) (c and d: H&E, ×40). Immunoperoxidase stain with antibody against OCT 3/4 shows absence of germ cell neoplasia in situ in atrophic tubules (e) (DAB and hematoxylin counterstain, ×200).

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