Definition: allelic to Hurler syndrome but with a much milder phenotype; characterized by a-l-iduronidase deficiency, corneal clouding, deformity of the hands, aortic valve involvement, and normal intelligence; autosomal recessive inheritance, caused by mutation in the alpha-l-iduronidase gene (IUDA) on chromosome 4p.
Synonym(s): mucopolysaccharidosis type IS
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