A Patient with Dyspnea and an Enlarged Right Ventricle.

Case report of a patient with no significant past medical history who presented with reports of dizziness, dyspnea on exertion, and palpitations that had been ongoing for at least 5 years. It demonstrates the importance of considering the presence of an inter-atrial shunt when evaluating a patient with an unexplained dilated right atrium and right ventricle.