目的 分析电子计算机断层扫描 (CT)与磁共振成像(MRI)在诊断直肠间质 瘤中的临床价值。方法 回顾性分析我院 2011年9月至2014年9月经病理证实为直 肠间质瘤的24例患者的CT和MRI表现，以 病理检查结果为准，比较CT和MRI两种诊 断方式对直肠间质瘤的诊断情况，比较 两种诊断方式的准确度、敏感度和特异 度。结果 CT诊断肿瘤形态不规则、肿瘤 坏死或囊变、肿瘤边缘不清晰、有向远 处脏器转移现象的概率分别为58.33%、 37.5%、62.5%、25%，MRI诊断肿瘤形态 不规则、肿瘤坏死或囊变、肿瘤边缘不 清晰、有向远处脏器转移现象的概率分 别为66.67%、54.17%、50%、29.17%； MRI检查的准确度为91.67%较CT 66.67% 显著较高(P＜0.05)。结论 CT与MRI诊断 直肠间质瘤的影像表现有一定特征，MRI 对病灶成分的检出率及病灶浸润范围的 检出率高于CT，CT与MRI检查能帮助选择 合适的治疗方案。

Objective To analyze the clinical value of computerized tomography (CT) and magnetic resonance imaging (MRI) in the diagnosis of rectal gastrointestinal stromal tumors. Methods The findings of CT and MRI of 24 patients with rectal gastrointestinal stromal tumors which was confirmed by pathology in our hospital during September 2011 to September 2014 were retrospectively analyzed. With the results of pathological examination as the standard, the accuracy, sensitivity and specificity of the two modes in the diagnosis of rectal gastrointestinal stromal tumors were compared. Results The probabilities of CT in the diagnosis of irregular tumors, tumor necrosis or cystic change, blurring tumor boundaries and metastasis to distant organs respectively were 58.33%, 37.5%, 62.5% and 25% while the probabilities of MRI diagnosis were 66.67%, 54.17%, 50% and 29.17% respectively. The accuracy of MRI was significantly higher than CT (91.67% vs 66.67%) (P<0.05). Conclusion The imaging findings of CT and MRI in the diagnosis of rectal gastrointestinal stromal tumors are different to certain degree. The detection rates of MRI to the compositions of lesions and the range of infiltration are higher than CT. CT and MRI examination can help to choose appropriate regimen.