Double Interatrial Septum appearing as an Atrial Myxoma: A Case Report and Review of the Literature

A double interatrial septum (DIS) is a rare finding during echocardiographic evaluation and can often be mistaken for other more common atrial anomalies. The interatrial cavity created by the septum creates a low-flow state that increases risk of thrombus formation and thromboembolic events. Transesophageal echocardiography (TEE) plays a vital role in accurate diagnosis as a DIS is often not seen during transthoracic echocardiography (TTE). In this case, we report a patient who presented for surgery with a preoperative diagnosis of an atrial myxoma, was instead discovered to have a DIS, and then subsequently underwent DIS resection without complication. We discuss the differential of a DIS, including an atrial septal pouch, cor triatriatum, atrial myxoma, and aneurysmal interatrial septum and the classic features of each anomaly for appropriate diagnosis and management. How to cite this article Wyrobek J, Brown CH IV, Kostibas MP, Mayer SA, Cameron DE, Hayanga HK. Double Interatrial Septum appearing as an Atrial Myxoma: A Case Report and Review of the Literature. J Perioper Echocardiogr 2017;5(1):16-20.