符号(数学)
皮肤病科
原位
医学
数学
化学
数学分析
有机化学
作者
Marcel C. Pasch,Julie Tutein Nolthenius
标识
DOI:10.1056/nejmicm2504151
摘要
A 71-year-old man presented with a 2-year history of a darkening line on his left thumbnail. Also noted were a brown discoloration of the left thumbnail and hyperpigmentation of the proximal nail fold and tip of the thumb.
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