脑灰质异位是在胚胎发育过程中，增殖的神经母细胞的不能及时地从脑室周围移到灰质所致。典型的灰质小岛位于脑室周围，可悬在室管膜上并突入侧脑室；大的灶性灰质异位，位于半卵圆中心，可有占位效应。
目的探讨脑灰质异位症（GMH）的MR I诊断及鉴别诊断。
Objective To evaluate the role of MRI in diagnosis and differential diagnosis of gray matter heterotopia(GMH).
目的：提出脑灰质异位症的M R I诊断分型，提高对本病的认识。
Objective: to have some understanding of MRI diagnostic typing of brain gray matter heterotopia.
方法：采用功能磁共振成像技术对3例拟行手术治疗的灰质异位且伴癫痫症状的患者进行对指运动任务下的脑区反应观察。
Methods: fMRI was used to localize the areas of motor activation in 3 patients with heterotopic gray matter who all suffered from epilepsy and prepared to be treated by surgery.
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