cor triatriatum

cor triatriatum
a congenital anomaly caused by failure of resorption of the embryonic common pulmonary vein, resulting in division of the left atrium by a fibromuscular diaphragm, the posterosuperior chamber receiving the pulmonary venous return and the anteroinferior chamber communicating with the left atrial appendage and mitral orifice. The orifice between the two compartments may be reduced or absent, producing pulmonary venous obstruction.

Echocardiogram (subxiphoid) of a young child with cor triatriatum. The membrane (large arrow) inserts proximal to the left atrial appendage (App) and distal to the pulmonary veins (PV).(LA), Left atrium; (LV), left ventricle.


Medical dictionary. 2011.

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