中文摘要：

目的 评价螺旋CT在直肠癌诊断中价值.方法 回顾性分析50例经手术病理证实的直肠癌的螺旋CT表现,观察肿瘤的生长方式、大小、密度、强化程度、侵犯周围组织及转移等特点,并与病理结果进行对照分析.结果 螺旋CT表现为肠壁不规则增厚、肠腔狭窄34例;软组织肿块16例,肿块偏心状生长,呈分叶状或不规则形,表面凹凸不平,并可见溃疡面;17例侵犯浆膜面;增强扫描增厚的肠壁明显强化.螺旋CT表现与手术病理对照结果：CT显示病灶准确性为98.0％（49/50）,显示淋巴结转移符合率为89.7％（26/29）,假阳性为10.3％（3/29）,假阴性为42.9％（9/21）.结论 直肠癌的螺旋CT诊断与手术病理分期有较好的一致性,CT是直肠癌术前诊断的重要检查方法.

英文摘要：

Objective To evaluate the value of CT in diagnosis of rectal caneor. Methods The CT performance of rectal cancer confirmed by clinic and pathology in 50 cases were retrospectively analyzed, the tumor growth pattern, size, density, degree of enhancement, invasion to the surrounding tissues and metastatic characteristics were observed, and the results were compared with pathological analysis. Results The CT finding：Irregular bowel wall thickening and luminal stenosis were found in 34 cases, soft tissue mass,mass-like eccentric growth lobulated or irregular-shaped, uneven surface, visible ulcers in 16 cases, invasion of serous membrane in 17 cases. Enhanced scan thickening of the intestinal wall was significantly enhanced. Comparison surgery and pathology; The accuracy of CT was 98.0%（49/50）. The rate in line with lymph node metastasis was 89.7 % （26/29）, false positive rate was 10.3 % （3/29）, false negative rate was 42.9% （9/21）. Conclusion CT diagnosis of rectal cancer with clinical stage is in good agreement, CT is an important method for examination of preoperative diagnosis.