膀胱原位癌(bladder caner in situ,BCIS)是膀胱粘膜移行上皮内形成稍突起的绒毛状红色片块,不侵犯基底膜,具有细胞分化不良等恶性形态的非乳头状尿路上皮的早期癌变.膀胱原位癌很少单独存在,常同时伴有恶性度高的、浸润深的或分化不良的乳头状癌.因此,将膀胱原位癌分为两类:一类为原发性原位癌;另一类为原位癌伴其他类型癌.后者又分为邻近原肿瘤与远 Bladder caner in situ (BCIS) is a villous red patch that protrudes slightly in the transitional epithelium of the urinary bladder and does not invade the basement membrane. Early stage carcinogenesis of non-papillary urothelial cells with malignant morphology such as poor cell differentiation In situ carcinoma of the bladder rarely exists alone and is often associated with malignant, infiltrating, or poorly differentiated papillary carcinoma.Therefore, bladder carcinoma in situ is divided into two categories: one is primary Cancer; the other is carcinoma in situ with other types of cancer, the latter is divided into adjacent to the original tumor and distant