de Musset sign means: De Musset sign: A rhythmic nodding of the head that synchronizes with the heartbeat, this is a sign you have an aortic leakage or incompetent aortic valve. Syphilitic aortitis and rheumatic fever are the causes. This disease is named after Alfred de Musset (1810-1857), a French Romantic poet/playwright.
(in Medical Dictionary)