[Mitral valve with double orifice. Report of a clinical case].

Double mitral valve orifice is an uncommon congenital heart defect. The isolated occurrence of this anomaly is exceptional and, more often, is encountered in association with other congenital cardiac abnormalities. We present a case of a functionally normal double mitral valve orifice, an "incomplete bridge" type, diagnosed by two-dimensional transthoracic echocardiography in a ten years old patient. Due to its rarity we have reviewed and discussed this entity and the echocardiographic features of its types.