本文着重介绍两个方面:国外有关膀胱肿瘤的组织学分类以及膀胱癌出现原发性多发性恶性肿瘤(PMMT)时的特点,这对膀胱癌的诊断、治疗、预后估计可能有所裨益。膀胱肿瘤的组织分类一、肿瘤的生长类型: 根据肿瘤切面的肉眼及组织学观察可分成6型。1.乳头状非浸润型(PNT);2.乳头状浸润型(PIT);3.非乳头状非浸润型 This article focuses on two aspects: the histological classification of bladder cancer in foreign countries and the characteristics of primary malignant tumor (PMMT) in bladder cancer, which may be helpful for the diagnosis, treatment and prognosis of bladder cancer. Tumor classification of the tumor First, the growth of the tumor type: According to the tumor section of the naked eye and histological observation can be divided into 6 types. 1. Papillary non-invasive type (PNT); 2. Papillary infiltrate type (PIT); ​​3. Non-papillary non-invasive type