An autosomal recessive lysosomal storage disease caused by mutation(s) in the HYAL1 gene, encoding hyaluronidase-1. It is characterized by short stature and hyaluronidase deficiency. The disease is mucopolysaccharidosis type 9 (MONDO_0011093). Also known as: MPS9, MPSIX, mucopolysaccharidosis type IX.