MR DWI、SWI在下肢肌肉血肿的临床应用

目的探讨MR DWI及SWI在下肢肌肉血肿的临床应用。材料与方法回顾性分析2009年6月至2011年6月间经手术或穿刺及临床随访证实的肌肉血肿15例患者MRI资料,所有患者均行TSE序列T1WI、T2WI和T2WI-Fs扫描,DWI及SWI扫描。结果急性期及亚急性早期血肿均呈与肌肉或肌间隙走形一致的长梭形,T1WI呈等或等高信号,T2WI呈等或高信号,DWI呈中央低信号,周围呈高信号,SWI呈高信号为主,中央呈不不规则片状低信号,周围可见不同程度环形低信号；亚急性晚期或慢性期血肿呈形态不规则圆形或长梭形,T1WI及T2WI均呈上部高信号,下部呈低信号,并形成明显液液平,DWI及SWI上部呈高信号,下部呈低信号。结论 DWI及SWI序列可以较MR常规序列提供更多的信息,作为常规序列的重要的补充,可以明显减少急性期及亚急性早期血肿的误诊和漏诊。

Application of DWI and SWI muscle hematoma in lower limb clinical diagnosis

Objective：To evaluate the diagnostic value of muscle hematoma in lower limb using the diffusion-weighted imaging （DWI） and susceptibility-weighted imaging （SWI）. Materials and Methods：Retrospective analysis between June 2009 to June 2011 by surgery or biopsy and clinical follow-up confirmed the muscle hematoma MRI data of 15 case, all patients were performed with MRI conventional sequences, including T1WI, T2WI, DWI and SWI. Results：In MRI conventional sequences acute and subacute hematoma showed early was to go with muscle or muscle gap consistent long spindle-shaped, in T1WI as equal/high signal intensity, in T2WI showed equal or higher signa intensity. In DWI lesions showed low signal center, surrounded by high signal and SWI showed high signal-based, central was not irregular lfakes low signal, visible in varying degrees around the ring of low signal. Late subacute or chronic hematoma was irregular round or fusiform, T1WI and T2WI showed high signal on the upper and lower showed low signal, and the formation of clear liquid lfuid level, DWI and high signal SWI upper and lower showed low signal. Conclusions：DWI and SWI sequence can be compared with conventional MR sequences provide more information, as an important complement conventional sequence, can signiifcantly reduce acute and subacute hematoma early misdiagnosis and missed diagnosis.