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Adducted thumbs with mental retardation: A syndromewith the following characteristic features:
The syndrome is inherited as an X-linked trait and so affects mainly boys. Alternative names include MASA syndrome (MASA stands for mental retardation, aphasia, shuffling gait, and adducted thumbs), claspedthumb and mental retardation, congenital clasped thumb with mental retardation, and theGareis-Mason syndrome.
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