囊性软组织病变的MRI诊断

MRI diagnosis of the cystic soft tissue lesions

目的:了解MRI对囊性软组织病变的诊断能力。方法:分析35个病变的部位、信号等MR征象。结果:皮质腺囊肿等位于皮肤和皮下,神经纤维瘤等位于肌间隙,腱鞘囊肿和滑膜肉瘤等位于关节旁,脂肪肉瘤等位于肌肉内。脓肿、转移瘤和血肿有灶周水肿,前二者中心区呈水样信号,亚急性期血肿T1WI与T2WI均呈高信号;粘液变性区T1WI呈略低、等或略高信号,T2WI呈高信号。结论:根据病变囊性区MRI信号特征可推测其囊性成分,结合其他MRI表现,多数囊性软组织病变的组织来源可以正确推断。

Objective:To evaluate th e efficacy of MRI in predicting the nature of cystic soft-tissue lesions.Methods:The following MR features of 35lesions,including the location and signal,were analyzed retrospectively.Results:The sebaceous cyst,located in skin or subcutaneous tissue;neurofibromas,in muscular spaces;ganglion and synovial sarcoma ,in paraarticula-tions,liposarcoma,in muscles.Marginal edema were found around abscesses,metastasis and hematomas,with the water-like sig-nal presenting in the former two lesions.On T 1 WI and T 2 WI ,subacute hematomas showed high signal.Mucus areas presented as slightly low-high signal on T 1 WI,and hign signal on T 2 WI.Conclusions:The fluid components of cystic soft-tissue lesions could be deduced according to their signals on MRI ,if combined with other MRI demonstrations,the histologic origins of most lesions could be correctly diagnosed.