腹膜后恶性间质瘤的CT诊断

CT diagnosis of retroperitoneal malignant stromal tumors

目的探讨腹膜后恶性间质瘤的CT表现。方法回顾性分析8例经手术或穿刺病理证实的恶性腹膜后间质瘤患者的临床资料及CT表现,8例均行CT平扫及双期增强扫描。结果均是单发肿块,肿块直径平均12 cm;直径>10 cm者6例,比例为75%。CT平扫肿块呈囊实性密度影,周围为软组织密度影,中央为不同程度低密度影(坏死或囊变),增强后呈轻中度不均匀性强化,增强后实性部分动脉期轻度强化,静脉期继续强化,囊变、坏死无明显强化。8例病理诊断恶性腹膜后间质瘤高度恶性6例,低度恶性1例,潜在恶性1例。结论腹膜后恶性间质瘤表现有一定特征性,对临床诊治有一定帮助。

Objective To investigate the CT features of retroperitoneal malignant stromal Tumors. Methods CT findings of 8 cases of retroperitoneal malignant stromal tumors were retrospectively analyzed. All patients were given CT plain scan and dual-phase enhancement scan. Results In all the cases the mass was isolated, with a mean diameter of 14.8 cm; di- ameter was above 10 cm in 75% cases （6/8）. The plain CT showed the tumors were solid and cystic, which mainly consisted of an outer solid part and central necrosis or cysts of various degrees. The solid part of tumors showed nonhomogeneous en- hancement in dual-phase enhancement CT scan. The enhancement degree on venous phase was higher than that on arterial phase. There was no enhancement of cystic degeneration and necrosis in tumors. Pathological results revealed that there were 6 cases of high-grade malignant tumors, 1 case of low-grade malignant tumor and 1 case of latent malignant tumor. Conclusion Retroperitoneal malignant stromal tumors have some CT features which are informative to diagnosis and treat- ment.