Among all of the21cases,the lesions of gray matter heterotopic which were bilateral in6cases,unilateral in17cases and multiple in6cases,were33including19lesions of nodular type,6le-sions of grand type and8lesions of band type.

• 21例中,病变为双侧4例,单侧17例,多病灶6例,共见异位灰质病灶33个; 结节型病灶19个,板层型病灶6个,桥带型病灶8个;