尾肠囊肿 (ｔａｉｌｇｕｔｃｙｓｔｓ)是一种十分罕见的、多发生在直肠后潜在间隙内的先天性囊肿。近 3年 ,我们发现并治疗了2例 ,报告如下。2例均为女性。其中 1例 (36岁 ) 1999年 3月因无痛性血便入院 ,直肠指诊可及直肠后壁外压性肿物。钡灌肠及ＣＴ示直肠后壁外压性肿物。 Tailgutcysts are a very rare form of congenital cysts that occur more often in the posterior rectum. In the past 3 years, we found and treated 2 cases, the report is as follows. 2 cases were female. One case (36 years old) was admitted to hospital for painless bloody stool in March 1999, and the digital rectal examination showed rectal wall compression. Barium enema and CT showed rectum wall external pressure of the tumor.