Abstract
Cor-triatriatum is uncommon and cor-triatriatum dexter is rarer, and patients may remain asymptomatic in isolated cases especially if the partitioning is mild and nonobstructing. There may be other cardiac defects associated with it which are mostly right-sided cardiac defects such as atrial septal defect, Ebstein anomaly, and pulmonary stenosis. However, left-sided heart anomaly such as aortic regurgitation has been associated with it, but its association with transposition of the great vessels has not been documented before now. Therefore, the case of a 3-month-old girl with cor-triatriatum dexter with transposition of the great vessels, and atrial septal defect is reported.