臀肌挛缩症的MRI应用价值

目的 探讨臀肌挛缩症(GMC)的MRI表现及其临床价值。方法 经临床及手术证实的臀肌挛缩症11例，均行X线平片及MR检查，常规行MRT1WI及T2WI，所有患者均加扫轴面及冠状面快速梯度回波(FFE)T2WI；5例行CT检查。结果 T1WI及T2WI显示11例受累臀肌萎缩；8例臀中、小肌萎缩明显，3例臀中、小肌萎缩、消失。FFE-T2WI显示11例患侧从髂骨至股骨粗隆间的挛缩纤维索条影，呈条带状低信号；阔筋膜张肌萎缩，与臀中、小肌分界不清。4例受累髋关节囊明显增厚。X线显示7例骨盆左侧倾斜，1例右侧倾斜，1例左侧股骨大粗隆轻度不规则。5例CT扫描显示3例骨盆倾斜，2例双侧臀肌大小不对称。结论 MRI能直接显示臀肌挛缩纤维索条影，指导临床治疗；FFE-T2WI序列是GMC的特异检查序列。

The application of MRI in gluteal muscle contracture

Objective To evaluate the MRI findings and its diagnostic value in gluteal muscle contracture (GMC). Methods Eleven clinic or operation confirmed GMC patients were examined by plain X-ray and MRI. Conventional T 1WI and T 2WI MR imaging were performed and FFE-T 2WI (fast field echo-T 2WI) was also scanned. CT scan was conducted in 5 cases. Results 11 GMC patients were all diagnosed by MRI. Conventional T 1WI and T 2WI could only show the atrophy of gluteal muscles, while FFE-T 2WI could directly show the fibrous band of gluteal muscle and its fascia, and the fibrous band appeared as low signal intensity on FFE-T 2WI sequence. Conclusions MRI is the efficient modality in imaging the fibrous band for GMC patients, and FFE-T 2WI is the most valuable sequence. MRI is very helpful in the diagnosis and treatment of GMC.