膀胱腺瘤一般认为起源于脐尿管残茎或化生性移行上皮(例如腺性膀胱炎)。这些肿瘤大都为腺癌,占膀胱癌总数的2％,而膀胱的良性腺瘤则极为罕见。腺性膀胱炎发展为腺癌已见报告,据认为这二者之间具有一定的联系。膀胱绒毛腺瘤虽然少见,一般不认为它和肠绒毛腺瘤一 Bladder adenoma is generally believed to originate from the residual stump or metaplastic epithelium (eg, cystitis glandularis). Most of these tumors are adenocarcinomas, accounting for 2% of the total number of bladder cancers, whereas benign adenomas of the bladder are extremely rare. Glandular cystitis develops into adenocarcinoma has been reported, it is believed that there is a certain relationship between the two. Although the bladder villous adenoma is rare, it is generally not considered it and intestinal villous adenoma one