目的:探讨脑灰质异位症的MRI表现特点及临床诊断分型,提高对脑灰质异位症的临床诊断能力.方法:回顾分析32例脑灰质异位症患者MRI资料,据其MRI表现进行分型.依据形态、大小及位置关系,可以将其分为:室管膜下结节型、室管膜下弥漫型、非室管膜下结节型及非室管膜下弥漫型4种类型.结果:32例患者共发现病灶40处.单灶24例、双灶8例.病灶位于大脑皮质下10个:结节型8个、弥漫型2个.位于室管膜下30个:局限结节型19个(其中侧脑室前角旁4个、侧脑室体部8个、侧脑室后角旁7个);病灶呈弥漫型11个(其中双侧室管膜下4例、单侧室管膜下3个).结论:脑灰质异位症的MRI表现具有一定的特征性,将脑灰质异位症正确分型能够提高对本病的认识,有助于临床做出正确的诊断.%Objective:To analyze MRI appearance and classification of gray matter heterotopia (GMH)and to investigate the diagnostic value of MRI in GMH.Methods:MRI images of 32 cases with GMH were retrospectively analyzed.According to the lesion distribution and location,heterotopia can be divided into local type and diffuse type.Based on the relationship of lesion and ependyma,heterotopia can be subdivided into subependymal type and nonsubependymal type.Results:A total of 40 focuses were found in 32 patients (single focus 24 cases,two focuses 8 cases).Ten focuses were in subcortical white matter,8 nodular focuses and 2 diffused type focuses.There were 30 subependymal focuses,19 nodular focuses and 11 diffused type focuses.Conclusion:Brain heterotopic gray matter has clinical features and MRI characteristics.MRI appearance and classification could improve the understanding of MRI manifestations.MRI is the optimal modality in diagnosing GMH.
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