ＴａＧ3膀胱肿瘤是指高度恶性无固有层浸润的浅表膀胱肿瘤 ,占新诊断膀胱肿瘤的 2 %～ 4%。与Ｔ1 Ｇ3膀胱肿瘤相比 ,对ＴａＧ3膀胱肿瘤的预后所知更少。ＢＣＧ膀胱灌注被认为是一种有效的预防和治疗高危险性浅表性膀胱移行细胞癌的方法。作者观察了ＢＣＧ膀胱灌注后ＴａＧ3膀胱 TaG3 bladder tumor is a superficial bladder tumor with non-lamina propria infiltrating into malignant tumors accounting for 2% ~ 4% of newly diagnosed bladder tumors. The prognosis for TaG3 bladder tumors is less known than T1 G3 bladder tumors. BCG bladder infusion is considered as an effective method to prevent and treat high-risk superficial bladder transitional cell carcinoma. The authors observed TaG3 bladder after BCG bladder irrigation