Lipomatous hypertrophy of the intraatrial septum resulting in right atrial inflow obstruction and atrial flutter.

Atrial arrhythmias can occasionally be associated with atrial structural abnormalities that may require sophisticated diagnostic imaging for management. Lipomatous hypertrophy of the intraatrial septum is generally considered a benign fatty infiltrative process usually limited to the atrial septum. We present a rare case of lipomatous hypertrophy of the intraatrial septum associated with atrial flutter and right atrial inflow obstruction in which atrial reconstruction alleviated not only the obstruction but also helped control a challenging arrhythmia. Copyright (c) 2010 The Society of Thoracic Surgeons. Published by Elsevier Inc. All rights reserved.