作者以MR及CT检查临床怀疑直肠癌复发共29例;女7例,男12例,年龄41-67岁。其中9例原手术为节段切除,仍保持大小便控制。20例为腹会阴直肠切除。有7例术后放疗。全部病例CEA增高和/或进行性骶骨前疼痛。其中11例为手术后第一年发现;10例为术后第二年。8例系术后2-6年怀疑复发。诊断均经手术、多次活检及随诊确证。作者见到,CT明确诊断者共11例,有4例假阳性,2例假阴性;12例诊断不能确定。MR则有23例诊断明确,无假阳性及假阴性,仅6例不能确定诊断。作者认为MR对复发肿瘤长T_2观察及纤维化的低信号强度有特征性,从而优于CT The authors examined 29 cases of clinically suspected rectal cancer recurrence by MR and CT. There were 7 females and 12 males, aged 41-67 years old. Nine cases of the original operation were segmental resections and still maintained urine control. Twenty patients underwent abdominal perineal rectal resection. There were 7 cases of postoperative radiotherapy. All cases had elevated CEA and/or progressive anterior tibial pain. Of these, 11 were found in the first year after surgery; 10 were in the second year after surgery. Eight patients had suspected recurrence 2-6 years after surgery. The diagnosis was confirmed by surgery, multiple biopsies, and follow-up examinations. The authors saw that there were 11 cases of definite diagnosis by CT, 4 cases were false positive, and 2 cases were false negative; 12 cases could not be diagnosed. In MR, there were 23 cases with clear diagnosis, no false positives and false negatives, and only 6 cases could not confirm the diagnosis. The authors believe that MR is superior to CT in the observation of long-term T_2 recurrence tumors and the low signal intensity of fibrosis.