Transesophageal echocardiographic image of double-chambered right ventricle.

Double-chambered right ventricle is a rare congenital heart disease. Anomalous muscle bundles in the right ventricle divide the right ventricle into two portions and cause intracavitary obstruction of the right ventricle. Transesophageal echocardiography of the double-chambered right ventricle has never been reported. We present a 32-year-old man with double-chambered right ventricle associated with perimembranous-type ventricular septal defect and left superior vena cava. Multiplane transesophageal echocardiography provides excellent views of an anomalous muscle bundle in the right ventricle, which differed from a moderator band by its insertion site on the right ventricle.