Dilated Unroofed Coronary Sinus Mimicking Cor Triatriatum in Cardiac‐Type Total Anomalous Pulmonary Venous Connection

A bstract  We present a rare case of a patient with a dilated unroofed coronary sinus mimicking cor triatriatum that altered mitral inflow in a cardiac‐type total anomalous pulmonary venous connection. The membranous tissue in the left atrium, thought to be cor triatriatum tissue preoperatively, was actually a remnant of a dilated coronary sinus tissue. Although this tissue did not create a significant pressure gradient and merely induced a turbulent mitral inflow, we resected it to avoid future problems with mitral leaflet function. (J Card Surg 2012;27:621‐623)