Megalencephalic Leukoencephalopathy with Subcortical Cysts 2a,也称为mlc2a,与Megalencephalic Leukoencephalopathy with Subcortical Cysts 2b,缓解型,伴有或不伴有智力发育障碍和跟腱囊肿有关,其症状包括共济失调、肌肉痉挛和癫痫发作。与Megalencephalic Leukoencephalopathy with Subcortical Cysts 2a相关的基因是HEPACAM(肝细胞和星形胶质细胞粘附分子),其相关通路/超级通路包括发育Slit-Robo信号通路和婴儿猝死综合症(SIDS)易感性通路。相关组织包括小脑和大脑,相关表型为巨脑和智力退化。