MONDO_0018938 (mucopolysaccharidosis type 4) is a lysosomal storage disease belonging to the group of mucopolysaccharidoses, and characterized by spondylo-epiphyso-metaphyseal dysplasia. It exists in two forms, A and B. Also known as: MPS4, MPSIV, Morquio disease, Morquio syndrome, Mucopolysaccharidosis IV, deficiency of chondroitinsulphatase, eccentro-osteochondrodysplasia, eccentrochondrodysplasia.