05.02.01 Divided left atrium (cor triatriatum sinister)

IPCCC Term Divided left atrium (cor triatriatum sinister)

IPCCC Code 05.02.01


Synonyms PENDING

Abbreviations PENDING

IPCCC Definition A congenital cardiac malformation in which there is a partition that divides the left atrium into a posterior chamber that receives some or all of the pulmonary veins and an anterior chamber that communicates with the left atrial appendage and atrioventricular junction (usually the mitral valve).

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[su_carousel source=”media: 5367,5368″ limit=”27″ width=”720″ height=”540″ responsive=”no” items=”1″ title=”no” centered=”no” mousewheel=”no”] The left panel shows a posterior view of an opened left atrial chamber and the pulmonary veins connecting to a posterior chamber. The yellow dashed arrow illustrates the path of the pulmonary venous drainage from the posterior chamber to the left atrial vestibule. The opened mitral valve guards the left atrioventricular junction. In the right panel this postero-superior view shows the partition dividing the posterior left atrial chamber from the atrial vestibule. The pulmonary veins drain into the atrial vestibule via a small opening (yellow dots) in the floor of the partition that divides the left atrium.

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