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Urothelial tumors in young patients. A, Papillary urothelial neoplasm of unknown malignant potential (hematoxylin-eosin, X 100). B, Low-grade papillary urothelial carcinoma(hematoxylin-eosin, X 100). C, High-grade papillary urothelial carcinoma(hematoxylin-eosin, X 100). D, Urothelial carcinoma invading the muscularis propria(hematoxylin-eosin, X 100).
