Repair of cor triatriatum associated with partially unroofed coronary sinus.

A young patient with cor triatriatum, secundum atrial septal defect, persistent left superior vena cava, partially unroofed coronary sinus, and moderate tricuspid regurgitation was documented to have both a left-to-right shunt from the common pulmonary venous chamber to the right atrium and a right-to-left shunt from the partially unroofed coronary sinus to the left atrium. Resection of the membrane dividing the left atrium, closure of the atrial septal defect and the partially unroofed coronary sinus with pericardial patches, and a tricuspid annuloplasty resulted in an excellent hemodynamic result.