椎管内神经纤维瘤的MRI诊断

目的:探讨椎管内神经纤维瘤的MR特征。方法:回顾性分析17例19个经手术病理证实且资料完整的椎管内神经纤维瘤MR表现。结果:19个肿瘤中15个为孤立的神经纤维瘤,MR图像上边界清楚;4个丛状神经纤维瘤,MR图像上整个或部分边界模糊。全部肿瘤T1WI为等-稍高或稍低信号,T2WI为多样的高信号,17个为不均匀的T2加权高信号,其中12个显示中央低信号,周围高信号的“靶征”。增强扫描,呈多样的强化,其中11个显示中央强化。结论:T1WI等-稍高或稍低信号,T2WI多样的高信号,“靶征”是椎管内神经纤维瘤的特征,肿瘤呈多样的强化,常显示中央强化。边界模糊时,应考虑丛状神经纤维瘤。

MRI Diagnosis of Spinal Neurofibroma

Objective:To research MR features of spinal neurofibroma.Methods:Magnetic resonance images of 19 surgically proved neurofibromas were retrospectively reviewed in 17 patients.Results:Of 19 neurofibromas,15 were solitary neurofibromas which were well circumscribed and 4 were plexiform neurofibromas which were ill defined on MR images.All tumors were iso-to slightly hyperintense or slightly hypointense on T_1-weighted images.On T_2-weighted images they were variably hyperintense,17 of which were inhomogeneous,and 12 of which showed a target pattern of increased peripheral signal intensity and decreased central signal intensity.They showed a variable degree of enhancement on enhanced T_1-weighted images,11 of which showed central enhancement.Conclusion:The MR features of neurofibroma are isoto slightly hyperintense or slightly hypointense on T_1-weighted images,variably hyperintense especially like a target on T_2-weighted images and variably enhanced that the center of the tumor is often enhanced on enhanced T_1-weighted images.If the lesion is ill-defined,the diagnosis of plexiform neurofibroma should be considered.