唐氏综合症 Down syndrome
（重定向自Trisomy 21 syndrome）
唐氏综合症（21-三体综合征，先天愚型，英文：Down syndrome或Down's syndrome）又在部分地区被俗称为“国际脸”或“国际人”，包含一系列的遗传病，其中最具代表性的第21对染色体的三体现象，会导致学习障碍、智力障碍等情况。这个病因的命名源自英国医生约翰·朗顿·唐（John Langdon Down）。唐氏在19世纪末首次描述唐氏综合症病理。
Trisomy 21 syndrome
中文百科
英语百科
Down syndrome 唐氏综合症
（重定向自Trisomy 21 syndrome）
Down syndrome (DS or DNS), also known as trisomy 21, is a genetic disorder caused by the presence of all, or part of a third copy of chromosome 21. It is typically associated with physical growth delays, characteristic facial features, and mild to moderate intellectual disability. The average IQ of a young adult with Down syndrome is 50, equivalent to the mental age of an 8- or 9-year-old child, but this can vary widely.
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