Fig. 4
a Gross specimens and pathology after surgery. The total length of the tumor is approximately 12 cm, the surface is smooth, the diameter of the tube is approximately 0.8–1.8 cm, the cut surface is grayish red, and the edema is translucent. b H & E staining (× 100) showed that urothelial hyperplasia conformed to polypoid changes, but no dysplasia or malignancy. c Immunohistochemistry indicates positive Gata3 nucleus. d Immunohistochemistry indicates negative CK20 cytoplasm