蜘蛛樣指(英語:Arachnodactyly)是一種手指腳趾異常細長的先天性或後天性疾病,而患者的拇指傾向手掌[1]。目前已經發現小纖維蛋白-1(fibrillin-1、FBN1)和小纖維蛋白-2(FBN2)的突變,與蜘蛛樣指相關。此外,蜘蛛樣指被指可能與高胱氨酸尿症先天性攣縮細長指、Loeys-Dietz綜合徵、馬凡氏症候群[2]埃勒斯-當洛二氏症候群[3] 有關。

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