Fig. 2

Histology of the seminal vesicle tumor (H&E staining, by OLYMPUS BX53). a The tumor cells are dense and arranged like strips (× 4). b The tumor has a fibrous capsule and the boundary is relatively clear (× 4). c Tumor cells line up around blood vessels to form a perivascular tumor-like structure (× 4). d The collagen with hyaline degeneration could be seen in stroma (× 10). e Old bleeding can be seen around the tumor (× 10). f The tumor is composed of round or polygonal cells and the cytoplasm is eosinophilic or transparent (× 20)