Pathological features of the testicular tumor. (A) The hematoxylin-eosin staining for the tumor depicts the oval or spindle-shaped tumor cells that are arranged in sheet-like or focal glandular patterns (arrows). The surrounding structures accompanying the tumor cells show fibrous bundles (arrowheads). A magnified view is shown in the right panel. (B–E) Immunohistochemistry for the tumor cells shows positive signals for vimentin (B), alpha-inhibin (C), ER (D), and AE1/AE3 (E). Arrows indicate the cells presenting these antigens.