Abstract
A total of one hundred forty-seven urothelial papillary tumors (UPT) from 14 cystectomy specimens were studied, matching the morphology of these tumors as seen with a dissecting microscope with the histology. Two kinds of papillae (digitate and laminar) were identified as the elementary structures of the UPT. According to their composition, urinary papillary tumors have been classified as: digitate (mainly digitate papillae), laminar (mainly laminar papillae), laminodigitate (tumors in which neither digitate nor laminar papillae clearly prevail).
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