mucopolysaccharidosis type 3 (MONDO_0018937) is a lysosomal disease characterized by progressive neurocognitive decline, severe  intellectual deterioration, loss of functional abilities, and premature death. Also known as: MPS3, MPSIII, Mucopoly-saccharidosis type 3, Mucopolysaccharidosis Type III, N-sulphoglucosamine sulphohydrolase deficiency, Sanfilippo disease, Sanfilippo syndrome, Sanfilippo's syndrome.