[Aneurysm of the anterior mitral leaflet - echocardiographic description].

Aneurysm of the anterior mitral leaflet is a rare complication of infective aortic valve endocarditis. The natural history of which is generally its rupture, with subsequent acute and severe mitral regurgitation. We describe a 78 years-old man without history of endocarditis, in whom transthoracic echocardiography was sufficient and transesophageal echocardiography was essential for the diagnosis of this lesion.