原发性输尿管肿瘤是泌尿系统少见的和诊断困难的疾患。其病因还不清楚。芳香氨可能是致癌物质,结石可能在罕见的扁平上皮癌成为致病因素。形态学方面可将上皮性肿瘤分为下列几组:1.乳头状肿瘤:乳头状瘤(良性,无浸润性),乳头状癌(有全部恶性特征)。2.原发性浸润性癌。由于乳头状瘤转变为乳头状癌的过程不很清楚,而组织学方面的鉴别又很困难,因而对这两类肿瘤一般是不加以区分的。所谓良性乳头状瘤都具有明显的恶变 Primary ureteral tumors are diseases that are rare and difficult to diagnose in the urinary system. The cause is not yet clear. Aromatic ammonia may be a carcinogen, and stones may become a pathogenic factor in rare squamous cell carcinoma. Morphologically, epithelial tumors can be divided into the following groups: 1. Papillary tumors: papilloma (benign, non-invasive), papillary carcinoma (having all malignant features). 2. Primary invasive carcinoma. Since the process of converting papilloma into papillary carcinoma is not very clear and histological identification is difficult, the two types of tumors are generally not distinguished. The so-called benign papillomas have significant malignant changes