髓外硬膜下肿瘤的MRI诊断  

MRI diagnosis of subdural extramedullary tumors

作　　者：范新华 董海波[2] 黄祥龙[2] 沈天真[2] 

机构地区：[1]浙江省义乌市人民医院放射科,浙江义乌322000 [2]复旦大学医学院华山医院放射科

出　　处：《医学影像学杂志》2004年第3期172-174,共3页Journal of Medical Imaging

摘　　要：目的 :评价MRI对髓外硬膜下肿瘤的诊断价值。方法 :对 6 0例髓外硬膜下肿瘤进行MRI扫描 ,并与手术病理结果对照分析。结果 :神经类肿瘤多呈长T1、T2 信号 ,易出现坏死、囊变 ,可跨越椎间孔 ,多呈不均匀强化。其中神经鞘瘤更易囊变 ,仅跨越单个椎间孔 ,神经纤维瘤常多发和跨越多个椎间孔。脊膜瘤呈稍长T1、等长T2 信号 ,一般均匀强化、不跨越椎间孔 ,部分可见脊膜尾征。脂肪瘤呈短T1、T2 信号 ,加脂肪抑制后呈低信号。皮样囊肿、表皮样囊肿及畸胎瘤多呈混杂信号 ,有时难以鉴别。结论 :MRI是发现髓外硬膜下肿瘤的首选方法 ,对诊断与鉴别诊断有重要价值。Objective:To evaluate MRI diagnosis value of subdural extramedullary tumors.Methods:60 cases of subdural extramedullary were examined by MRI,analyzing the MRI findings with the results of operation and pathology.Results:Neuromas tended to show isointension on T 1WI and hyperintension on T 2WI,frequently associated with necrosis cyst,crossing intervertebral foramen and markedly heterogeneous enhancement.Neurilemomas were characterized by cyst and crossing single intervertebral foramen.Neurofibromas were characterized by multipe and crossing several intervertebral foremens,Meningiomas tended to show slight hyporintension on T 1WI and isointension or hyperintension on T 2WI,moderate homogeneous enhancement,showing dural sign tail and no crossing intervertebral.Lipoma tended to show high signal intensity lesion on T 1WI and T 2WI,after it was STIR showing low signal intensity lesion.Dermoid cyst,epidermoid and teratoma were showed complicated signal intensity lesion,it is sometimes difficulty to define diagnosis.Conclusion:MRI is first way to discover and correct diagnosis in subdural extramedullary tumors.

关 键 词：髓外硬膜下肿瘤 磁共振成像 

分 类 号：R445.2[医药卫生—影像医学与核医学] R739.42[医药卫生—诊断学]