One of the varieties of De Musset’s sign. The term refers to a picture of Abe Lincoln during the Civil War,
showing the president quietly sitting with legs crossed and the tip of the raised foot fuzzy and indistinct. Since 19th-century photography required long exposure times, this clue suggested that Lincoln might have had aortic regurgitation, probably from Marfan’s syndrome, and that the fuzziness of the foot could have been due to its bobbing with each heartbeat.
showing the president quietly sitting with legs crossed and the tip of the raised foot fuzzy and indistinct. Since 19th-century photography required long exposure times, this clue suggested that Lincoln might have had aortic regurgitation, probably from Marfan’s syndrome, and that the fuzziness of the foot could have been due to its bobbing with each heartbeat.