LAMA2 and megalencephalic leukoencephalopathy with subcortical cysts: Pathogenic variants in one such protein, laminin α2, lead to Merosin‐deficient Congenital Muscular Dystrophy (CMD) (Helbling‐Leclerc et al. 1995), and MRI abnormalities of the brain white matter in these patients display striking similarities with MLC (Philpot et al. 1995; van der Knaap et al. 1997).