[An isolated cleft of the anterior leaflet of the mitral valve--a case report].

A case of 44-year-old female, with an isolated mitral cleft, a rare congenital cause of mitral insufficiency is presented. The echocardiogram showed the presence of mild mitral regurgitation and a cleft of the anterior mitral valve leaflet was evident. Transesophageal echocardiography confirmed those findings. There were no other anomalies.