Cor triatriatum:  congenital stenosis of the common pulmonary vein.
D018376:Cardiovascular Abnormalities / Q000473:pathology*; D003251:Constriction, Pathologic; D003310:Cor Triatriatum; D006801:Humans; D011667:Pulmonary Veins
CARDIOVASCULAR DEFECTS, CONGENITAL/pathology