Extrinsic nonvalvular mitral obstruction due to large epicardial hematoma.

A case of extrinsic nonvalvular mitral obstruction due to a large epicardial hematoma in a patient with rheumatoid constrictive pericarditis is described. The patient had longstanding rheumatoid arthritis and a mitral diastolic murmur developed. Mitral obstruction was confirmed by a hemodynamic study. Coronary angiography and left ventricular angiography showed severely diseased coronary arteries and a distorted left ventricular cavity. Autopsy demonstrated rheumatoid arthritis, a normal mitral valve, thickened pericardium, and epicardial hematoma surrounding both ventricles at the atrioventricular junctional level.