尿路内翻性乳头状瘤(urinary inverted papillary,UIP)是一种少见的肿瘤,该肿瘤多单发,局限于黏膜层,肿瘤细胞罕见核异型和有丝分裂像,目前尚未有远处转移的报道,故多数学者认为它属良性肿瘤.它与尿路上皮癌(urothelial carcinoma,UC)有质的区别,治疗大多采取黏膜下切除术即可达到根治目的,一般不复发,癌变罕见.组织学上,UIP除了表面被覆了数层较正常的尿路上皮外,其余组织结构与UCⅡ级相似.

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