Progressive cerebello-cerebral atrophy and progressive encephalopathy with edema, hypsarrhythmia and optic atrophy may be allelic syndromes.
Hady-Cohen R, Ben-Pazi H, Adir V, Yosovich K, Blumkin L, Lerman-Sagie T, Lev D. Eur J Paediatr Neurol. 2018 Nov; 22(6):1133-1138. Epub 2018 Jul 26.