Mucopolysaccharidosis, Type Ix, also known as mucopolysaccharidosis type ix, is related to mucopolysaccharidosis-plus syndrome and natowicz syndrome. An important gene associated with Mucopolysaccharidosis, Type Ix is HYAL1 (Hyaluronidase 1), and among its related pathways/superpathways is Glycosaminoglycan metabolism. The drug Coal tar has been mentioned in the context of this disorder. Affiliated tissues include eye and bone, and related phenotypes are short stature and abnormal acetabulum morphology