MONDO_0018868 (metachromatic leukodystrophy) is a rare lysosomal storage disorder characterized by intralysosomal accumulation of sulfatides in various tissues, leading to progressive deterioration of motor and neurocognitive function. Also known as: MLD, Scholz cerebral sclerosis, arylsulfatase A deficiency, deficiency of cerebroside-sulfatase, sulfatide lipoidosis.