Morquio syndrome: Clinical findings in 11 patients with MPS IVA and 2 patients with MPS IVB

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Genetic heterogeneity of the Morquio syndrome has been known since deficiency of β-galactosidase was detected in some patients in addition to the deficiency of N-acetylgalactosamine-6-sulphate sulphatase in the classical form of Morquio syndrome. The clinical findings of 11 patients with MPS IVA, the classical form, and 2 patients with MPS IV B, a variant form, are described. All of the patients with MPS IV A showed extraskeletal manifestations of their disease. The patients with MPS IV B seem to be less severely affected.