Mucopolysaccharidosis type I
Mucopolysaccharidosis type I is a spectrum of diseases in the mucopolysaccharidosis family. It results in the buildup of glycosaminoglycans (or GAGs, or mucopolysaccharides) due to a deficiency of alpha-L iduronidase, an enzyme responsible for the degradation of GAGs in lysosomes.
Source: Wikipedia — Mucopolysaccharidosis type I (CC BY-SA 4.0)