Discussion

Cor triatriatum is a congenital cardiac abnormality with three atria, first reported in 1868 [1]. It is found in 0.1% of cases with congenital heart disease [2]. In cor triatriatum, the atrium is divided into two parts by a fold of tissue, a membrane, or a fibromuscular band; which can occur in LA, named cor triatriatum sinistrum. This can occur in right atrium (cor triatriatum dextrum). The classical cor triatriatum in LA is divided into two chambers by a fibromuscular membrane: a posterosuperior chamber receiving the pulmonary veins, and an anteroinferior chamber (true left atrium) contacts with the mitral valve and contains the atrial appendage and true atrial septum that bears fossa ovalis [3].

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