Echocardiographic Diagnosis of Divided Right Atrium-Cor Triatriatum Dextrum

First reported in 1868, cor triatriatum, that is, a heart with 3 atria (triatrial heart), is a congenital anomaly in which the left atrium (cor triatriatum sinistrum) or right atrium (cor triatriatum dextrum) is divided into two parts by a fold of tissue, a membrane, or a fibromuscular band. As far as division of the morphologically left atrium (cor triatriatum) is a recognized clinical and surgical entity. Division of the right atrium (prominence of the eustachian and thebesian valves) is recognized pathologically, but is rare. A partition division the right atrium was attached to the orifice of the inferior caval vei. The dividing partition is placed between the systemic venous sinus and the distal part of the right atrium, made up of the vestibule and appendage. This report describes a case of a divided right atrium, associated with a large atrial septal defect and valvular pulmonary stenosis.