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Medical Definition of Mucopolysaccharidosis I
1. Systemic lysosomal storage disease caused by a deficiency of alpha-l-iduronidase and characterised by progressive physical deterioration with urinary excretion of dermatan sulfate and heparan sulfate. There are three recognised phenotypes representing a spectrum of clinical severity from severe to mild: hurler's syndrome, hurler-scheie syndrome and scheie's syndrome (formerly mucopolysaccharidosis v). Symptoms may include dwarfism, hepatosplenomegaly, gargoyle-like facies, corneal clouding, cardiac complications, and noisy breathing. (12 Dec 1998)