原位癌是指癌性病变局限在上皮细胞尚未突破基底膜。Melamed 等1964年报道一组膀胱原位癌,尿脱落细胞学检查均发现癌细胞,但膀胱镜检查却不见肿瘤,本病诊断仅能靠尿细胞学检查和膀胱粘膜活检,治疗效果不满意。本文报告两例膀胱 Carcinoma of the abdomen in situ refers to the limitations of cancerous lesions in epithelial cells have not yet broken the basement membrane. Melamed et al reported in 1964 a group of bladder carcinoma in situ, urine cytology found cancer cells, but did not see cystoscopy tumor diagnosis of the disease can only rely on urinary cytology and bladder biopsy, the treatment is not satisfied. This article reports two cases of bladder