臀肌挛缩症的MRI应用价值

The application of MRI in gluteal muscle contracture

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T2 WI ,所有患者均加扫轴面及冠状面快速梯度回波 (FFE)T2 WI ;5例行CT检查。结果 T1WI及T2 WI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 T2 WI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 T2

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.