Evaluation of a sinus venosus atrial septal defect by magnetic resonance: a case report.

Although superior sinus venosus is one of the major types of atrial septal defect (ASD), diagnosis is usually more difficult than the more common forms. We report a case in which cardiovascular magnetic resonance (CMR) was useful in evaluating a patient presenting with right heart dilatation. Besides establishing the diagnosis of atrial septal defect, it also documented the anomalous drainage of a pulmonary vein.