De Musset sign
Rhythmic nodding or bobbing of the head in synchrony with the heart beat, a sign of aortic insufficiency --incompetence of the aortic valve with aortic regurgitation.
The causes include syphilitic aortitis, rheumatic fever, and aortic aneurysm.
Named after the French Romantic poet and playwright Alfred de Musset (1810-1857)