Surgical Management of a Giant Left Atrial Appendage Aneurysm in a Symptomatic Neonate.

A 4-day-old, 3.7-kg neonate presented to our institution with a systolic heart murmur and signs of respiratory distress and was found to have a giant left atrial appendage aneurysm on transthoracic echocardiogram. Given the compression of the left ventricle and signs of respiratory failure necessitating mechanical ventilation, the decision was made to proceed with surgical resection under cardiac arrest with cardiopulmonary bypass.