Mucopolysaccharidosis type VII (MPS VII) is a very rare lysosomal storage disease belonging to the group of mucopolysaccharidoses. The disease is mucopolysaccharidosis type 7 (Monarch Disease Ontology term MONDO_0009662). Also known as: Beta-glucuronidase deficiency, MPS VII - Sly syndrome, MPS7, MPSVII, Mucopolysaccharidosis Type VII, Sly disease, Sly syndrome, beta-glucuronidase deficiency.