胃肠道间质瘤CT、MRI征象分析

Manifestation of gastrointestinal stromal tumor on CT and MRI

目的:探讨胃肠道间质瘤(GIST)CT、MRI表现及其价值。方法:回顾性分析39例胃肠道间质瘤患者,18例经CT检查,其中7例行增强扫描;21例经MRI检查,其中18例行增强扫描。结果:肿瘤发生于胃20例、食管2例、十二指肠3例、小肠5例、结肠2例、肠系膜5例,2例广泛腹腔内转移,最终未确定原发部位。CT、MRI上肿瘤为软组织分叶状肿块,边界清楚,27例有出血坏死、囊变,肝脏转移3例,腹腔多发种植转移3例,未见淋巴结转移;钙化1例。增强扫描,肿瘤呈中度到明显强化。定位准确度79.5%。结论:CT、MRI对胃肠道间质瘤定位准确,表现有一定特征,可以提示诊断。

Objective：To investigate the manifestations of gastrointestinal stromal tumor （ GIST） on CT and MRI.Methods：CT or MRI findings were retro-spectively examined in 39 patients with GIST.CT was performed in 18 patients, in whom 7 underwent enhanced CT examination.Another 18 of 21 received enhanced MRI detection.Results：The tumor originated in stomach in 20 cases, at esophagus in 2, at duodenum in 3, at small intestine in 5, at colon in 2, in mesentery in 5.Intra-abdominal metastasis occurred in 2, and failed to be located.CT and MRI image revealed lobulated mass at the soft tissues involved, with clear tumor margin.Hemorrhagic necrosis was identified in 27 cases, and cystoid degeneration or liver metastasis was found in 3. Multiple abdominal implantation metastasis was seen in another 3.Lymph node metastasis was absent, yet calcification occurred in 1 case.Enhanced scanning demonstrated that the tumor was presented with moderate to significant enhancement signal, and 79.5% of the tumors were precisely identified by CR or MRI.Conclusion：CT and MRI may be competent to detection of GIST by precise location and typical manifestation .