Abstract
A 7-year-old girl presented with a language disorder reminiscent of verbal auditory agnosia. Later, she proved to have defective N-acetylglucosamine-6-sulfate sulfatase, the enzyme deficient in Sanfilippo D syndrome. She did not show clinical features of mucopolysaccharidosis. The language disorder had a fluctuating course, which eventually evolved into a progressive dementing encephalopathy.
MeSH terms
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Agnosia / diagnosis*
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Agnosia / genetics
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Brain / pathology
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Brain Diseases, Metabolic / diagnosis*
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Brain Diseases, Metabolic / genetics
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Child
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Child, Preschool
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Dementia / diagnosis
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Dementia / genetics
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Female
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Follow-Up Studies
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Humans
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Language Development Disorders / diagnosis*
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Language Development Disorders / genetics
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Magnetic Resonance Imaging
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Mucopolysaccharidosis III / diagnosis*
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Mucopolysaccharidosis III / genetics
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Sulfatases / deficiency
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Sulfatases / genetics
Substances
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Sulfatases
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N-acetylglucosamine-6-sulfatase