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Inverted Urothelial Neoplasm of LMP

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This tumor shows an exophytic papillary component with true fibrovascular cores as well as an endophytic, inverted papilloma-like component. The lamina propria shows anastomosing cords and nests of urothelial cells without destructive stromal invasion. There is no cytologic atypia. Such cases may be classified as inverted urothelial neoplasm of low malignant potential, although the current WHO/ISUP Classification does not address this category.

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