Anomalous right ventricular muscle bundle. Repair through the right atrium.

Anomalous muscle bundles within the right ventricle may cause obstruction to blood flow at the level of the outflow tract. This condition is usually associated with a ventricular septal defect. Although complete correction is usually approached through a right ventriculotomy, the anatomic configuration makes repair through a right atriotomy more suitable. The advantages of this approach are discussed and a case report is presented.