<unk> , also known as Mucopolysaccharidosis Type IV (MPS IV), is a rare metabolic disorder in which the body cannot process certain types of sugar molecules called glycosaminoglycans (AKA GAGs, or mucopolysaccharides). In<unk> , the specific GAG which builds up in the body is called keratan sulfate. This birth defect, which is autosomal recessive, is a type of lysosomal storage disorder. The buildup of GAGs in different parts of the body causes symptoms in many different organ systems. In the US, the incidence rate for<unk>  is estimated at between 1 in 200,000 and 1 in 300,000 live births.
Morquio syndrome
Eiken syndrome
Hapnes Boman Skeie syndrome
Zieve's syndrome
Galloway Mowat syndrome
Schimmelpenning syndrome
Okamoto syndrome
Sanjad-Sakati syndrome