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| Clubbed thumb ： ウィキペディア英語版 |
Clubbed thumb
"Clubbed thumb" is a misnomer for stub(by) thumb, known clinically as brachydactyly type D, or BDD. BDD is a harmless genetic trait characterized by the last bone of one or both thumbs being short and round with an accompanying short and wide nail bed.
Digital clubbing, however, is a "clinical sign associated with a number of diseases."
Because of the supposed high incidence of BDD among European royalty in the past, BDD is claimed by some to be a marker of descent from European nobility.
==Other names==
The condition is also sometimes known as potter's thumb.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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