目的　探讨直肠癌术后复发的CT诊断价值。方法　对 47例直肠癌术后患者行低张口服造影剂结合灌肠 (保留肛门者 )进行CT平扫和增强扫描 ,对局部改变进行分类 ,分析局部复发的CT征象。结果　 47例中 ,肿瘤复发 2 6例 ,其中骶前球形软组织块 13例 ,直肠壁不规则增厚 8例 ,骶前扁平软组织块 2例 ,低密度包块 3例。复发灶强化程度高于良性病变。结论　骶前强化明显的球形、不规则、不对称性软组织影或直肠壁不规则增厚是常见的复发表现。低张灌肠结合增强CT扫描有助于直肠癌术后复发的诊断。 Objective To investigate the diagnostic value of CT in rectal cancer recurrence. Methods Forty-seven patients with postoperative rectal cancer underwent low-contrast oral contrast-enhancing enema (retaining anus) with CT plain scan and enhanced scan, local changes were classified, and local recurrence CT signs were analyzed. Results Among 47 cases, tumor recurrence occurred in 26 cases, including 13 cases of presacral spherical soft tissue mass, 8 cases of irregular thickening of rectal wall, 2 cases of presacral flat soft tissue mass, and 3 cases of low density mass. The degree of recurrent lesions is stronger than that of benign lesions. Conclusion The enhancement of obvious spherical, irregular, asymmetrical soft tissue shadows or irregular thickening of the rectal wall is a common recurrent manifestation. Low-enema combined with enhanced CT scan is helpful for the diagnosis of rectal cancer recurrence.