Bacterial endocarditis in a patient with Marfan's syndrome.

A patient with Marfan's syndrome and subacute bacterial endocarditis is presented. Echocardiographic studies demonstrated dilatation of the aortic root, prolapse of the posterior leaflet of the mitral valve, and the appearance of shaggy echoes on the anterior miltral leaflet, of the kind previously described as representing bacterial vegetations.