胃肠道间质瘤肝脏转移灶的CT和MRI特点

CT and MRI features of liver metastases of gastrointestinal stromal tumor

目的探讨肝脏转移性胃肠道间质瘤(gastrointestinal stromal tumor,GIST)的CT和MRI特点。方法收集我院和浙江大学附属第一医院经病理证实的肝脏转移性GIST的CT和MRI图像共17例,分析其影像学表现特点。结果病灶多发的6例,单发的11例,单发病灶的平均直径约4.65cm。15例病灶发生坏死,8例病灶出现出血,1例病灶内钙化。增强扫描13例病灶周边实性部分动脉期明显强化,4例静脉期强化为主。10例可见肿瘤边缘粗大血管供血。结论肝脏转移性GIST单发相对比较多见,病灶容易发生坏死出血,病灶实性部分有粗大的供血动脉,动脉期明显强化,密度或信号高于肝实质,延迟期强化减退,密度或信号低于肝实质。

Objective To explore the CT and MRI features of liver metastases of gastrointestinal stromal tumor （GIST）. Methods The CT and MRI images of a total of 17 patietnes with liver metastases of GIST confirmed by pathology from our hospi- tal and the first hospital affiliated to zhejiang university liver metastatic GIST were collcted and the characteristics of imaging find- ings were analyzed. Results 6 cases were multiple lesions and 11 cases were single lesion with an average of 4.65 cm in diameter. The focal necrosis was found inl5 cases, haemorrhage in 8 cases, and calcification within the lesion in 1 case. Large blood vessel at the tumor margin for blood supply was seen in 10 cases. Conclusion Single liver metastases of GIST are relatively commen and the lesions are prone to be necrosis and bleeding. Solid lesion component has a large blood vessel for blood supply. Apparent enhancement appears at arterial phase and density or signal is higher than that of liver parenchyma. The enhancement subsides at delay phase and density or signal is lower than that of liver parenchyma.