患者男 ,75岁。因间歇性血便 4年余 ,加重半年入院。经结肠镜检查诊断为乙状结肠癌 ,择期手术 ,术前超声检查发现右下腹约 5 .0 cm× 4 .4 cm的囊性包块 ,境界清 ,内透声好 ,一侧囊壁上可见絮状偏强回声附着 (图 1) ,CDFI未见明显血流信号 ,诊断为肠系膜囊肿。术中所见 :阑尾肿 Male patient, 75 years old. Due to intermittent bloody stool more than 4 years, increased six months admission. Colonoscopy was diagnosed as sigmoid colon cancer, elective surgery, preoperative ultrasonography found right lower quadrant of about 0.5 cm × 4. 4 cm of cystic mass, clear boundary, the sound is good, one side of the cystic wall can be seen Xu Strong partial echo attachment (Figure 1), CDFI no significant blood flow signals, the diagnosis of mesenteric cysts. See intraoperative findings: appendix