报告５例小儿闭合性输尿管损伤，其中４例在伤后１个月才出现腹痛、发热、腰部包块，经Ｂ超检查提示腹膜后囊性包块。５例均接受手术治疗，结果：随访１～５年，术后效果满意。结合文献对其病因、临床表现、诊断及治疗方法进行讨论。认为小儿闭合性输尿管损伤早期缺乏典型症状，易误诊，晚期往往以腹部包块就诊。经Ｂ超和排泄性尿路造影明确诊断后应立即手术探查，切除假性含尿囊肿，重建输尿管的连续性。 Reported 5 cases of children with closed ureteral injury, including 4 cases 1 month after injury abdominal pain, fever, lumbar mass, the B-ultrasound examination showed retroperitoneal cystic mass. 5 cases were treated by surgery, the results: 1 to 5 years follow-up, satisfactory results. Combined with the literature on the etiology, clinical manifestations, diagnosis and treatment are discussed. That the lack of early childhood closed ureteral injury typical symptoms, easy to misdiagnosis, often in late abdominal mass treatment. The B ultrasound and urinary tract urography after a clear diagnosis should be immediately surgically detected, resection of pseudocyst containing urine, reconstruction of the continuity of the ureter.