小肠间质瘤的CT诊断

目的:探讨和分析小肠间质瘤(GIST)的CT检查方法和表现特点。方法:回顾分析我院2001年9月~2005年2月间经手术、病理、免疫组化确诊的小肠间质瘤病例20例,所有病例均作了CT增强检查和多平面重建观察,结果:病灶发生于十二指肠6例,回肠10例,空肠4例。其中10例为良性间质瘤,10例为恶性间质瘤,平扫时病灶密度通常较均匀,但也可不均匀,增强后肿瘤均明显强化,良性肿瘤直径平均为2.4cm,恶性肿瘤直径平均为7.6cm,以4cm直径为界判定其良、恶性,则符合率可达90%。结论:多层螺旋CT(MSCT)是小肠间质瘤主要的影像学诊断方法,以饮水法充盈肠腔并作增强后双期扫描有利于提高诊断质量,根据肿块大小可有助于良、恶性肿瘤的鉴别。

Radiological diagnosis of small bowel gastrointestinal stromal tumor by CT examination: a report of 20 cases analysis

Objective To discuss and study CT examination technique and manifestation features of small bowel gastrointestinal stromal tumors (GISTs). Methods Twenty cases with GIST confirmed by surgery,pathology and immunohistochemistry staining in our hospital from 2001 to 2005 were retrospectively analyzed. CT enhancement and multiplanar reconstruction were carried out. Results The lesion sites were duodenum(6 cases),jejunum(4 cases) and ileum(10 cases).Ten cases were benign and 10 cases were malignant diagnosed by CT. The homogenous density was usually seen in CT plain; however,but the heterogenous density was also observed. The mean diameter of benign tumor was 2.4 cm while that of malignant tumor was 7.6 cm. Benignancy or malignancy of tumor was judged by its size with the standard of 4 cm. The rate of accordance by this method was 90%. Conclusions Multislice spiral CT(MSCT) is the main radiology method for the diagnosis of small bowel GISTs. When small bowel is well filled with water,the biphase CT enhancement scan is helpful to improve the diagnosis quality. The mass size can differentiate the benign tumor from the malignant tumor.