MRI诊断妇科盆腔恶性肿瘤放疗后的放射性肠炎

目的：探讨妇科盆腔恶性肿瘤放疗后所导致的放射线肠炎（ RE）磁共振成像（ MRI）特征。方法选取武警医院放射科进行MRI检查，并经内镜活检或手术证实的RE患者50例，回顾性分析其临床资料和MRI特征。结果 RE主要发生在放疗后4～8月；发生部位在小肠46．0％，直肠22．0％，结肠32．0％；MRI主要特征表现为肠壁明显增厚，T2W、DWI上肠壁表现为环状分层信号，呈靶征样分层改变；CT检测发现163处病变，MRI发现171处，MRI和CT检出病变肠段的符合率为91．8％（χ2＝0．375，P＞0．05）。结论妇科盆腔恶性肿瘤放疗后的放射性肠炎具有一定的MRI特征，具有临床诊断价值。

MRI diagnosis of radioactive enteritis caused by pelvic malignant tumor after radiotherapy

Objective To investigate the MRI characteristics of radiation enteritis （ RE） caused by gynecologic pelvic malignant tumor after radiotherapy .Methods Fifty patients with RE performed MRI examination , and they were confirmed by endoscopic biopsy or surgery . Retrospective analysis was conducted on clinical data and MRI characteristics .Results RE mainly happened in 4 -8 month after radiotherapy.The location of RE was in small intestine （46.0%）, rectum （22.0%） and colon （32.0%）.The MRI features of RE was thicken bowel wall, and annular layered signal was found in T2W and DWI intestinal wall with target sign layered change .By CT examination 163 lesions were found, and 171 lesions were found by MRI.MRI and CT detection coincidence rate was 91.8% （χ2 =0.375,P〉0.05）.Conclusion The RE of gynecology pelvic malignant tumor after radiotherapy has certain MRI characteristics with clinical diagnostic value .