目的 探讨128层螺旋CT诊断胃肠 道间质瘤(GIST)的影像学表现及诊断价 值。方法 回顾性分析34例GIST患者的病 例资料及CT影像学资料，观察CT影像学表 现。结果 34例患者中，极低危险度3例， 低危险度9例，中等危险度7例，高危险度 15例。极低、低危险度肿瘤好发于胃部、 肿瘤最大径＜5cm，内生型为主，形态规 则，增强扫描显示明显强化、均匀强化； 而中、高危险度可发生于任何部位、肿瘤 最大径多＞5cm，以外生型为主，形态不 规则，少数存在远处转移，增强扫描显示 不明显强化、不均匀强化。结论 128层螺 旋CT诊断GIST有明显的影像学特征，对判 断疾病危险度有重要价值。

Objective To investigate the imaging findings and diagnostic value of 128 slice spiral CT in gastrointestinal stromal tumors (GIST). Methods The clinical data and CT imaging data of 34 patients with GIST were analyzed retrospectively, and the CT imaging findings were observed. Results Among the 34 cases of patients, there were 3 cases with extremely low risk, 9 cases with low risk, 7 cases with moderate risk, and 15 cases with high risk tumors. Extremely low and low-risk tumors usually occurred in the stomach, the largest diameter of tumors was shorter than 5cm, the main type was internal type, the shapes were regular, and the enhanced scan showed obvious enhancement and homogeneous enhancement. Moderate and high-risk tumors could occur in any site, the maximum diameter of tumors was longer than 5cm, the main type was exogenous type, the shapes were irregular, there were few distant metastases, and the enhanced scan showed non obvious enhancement and inhomogeneous enhancement. Conclusion The findings of 128 slice spiral CT are obvious in the diagnosis of GIST, which is of great value in judging the risk of the disease.