炎症性肌病中磁共振成像的诊断价值

目的探讨炎性肌病中磁共振成像的表现及其诊断价值。方法对16例多发性肌炎、3例包涵体肌炎行双下肢磁共振成像SE序列T1WI,快速自旋回波序列(FSE)T2WI扫描。结果多发性肌炎与包涵体肌炎均表现为:在T1WI上为等T1信号,在快速自旋回波序列T2WI上表现为两侧对称性、小片状分布的稍高信号,肌束形态无明显异常,肌束界限清楚。结论磁共振成像是诊断炎性肌病有效的辅助方法。自旋回波序列(FSE)T2WI是诊断肌炎最敏感的序列,对肌炎肌肉活检的部位的选择有指导意义。

MR imaging diagnosis of polymyositis

Objective To explore the musculoskeletal MR findng in polymyositis and inclusion body myositis.The role of MR in diagnosis of myositis was evaluated.Methods 16 patients with polymyositis and 3 patients with inclusion body myositis confirmed by pathology underwent T1 weighted,T2 weighted (fastspinecho, FSE 4000/100),and fat suppressed MR images.MR findings in these patients were analyzed.Results Within all the polymyositis patients and inclusion body myositis,MR showed symmetrical slight high patchy signals on T2-weighted in the muscles of bilateral thighs,but the morphology of muscles appeared normal in all patients.There was correlation between serum muscle enzyme and the signal intensity as well as affected field of myositis.The myositis often affected gluteus and the external lateral muscles in the lower part of thighs.Conclusion MR is an efficient accessary examination and T2 weighted (FSE) is a sensitive sequence in the diagnosis of myositis. Muscle biopsy can be directed by MRI.