Pontocerebellar hypoplasia type 1 (PCH1), also known as Norman's disease, is a clinically and genetically heterogeneous group of autosomal recessive disorders with a prenatal onset characterized by diffuse muscular atrophy secondary to pontocerebellar hypoplasia and spinal cord anterior horn cell degeneration resulting in early death. The disease is pontocerebellar hypoplasia type 1 (MONDO_0016396). Also known as: MRT32, Norman disease, PCH1.