Cor triatriatum

Case contributed by Fabien Ho
Diagnosis certain

Presentation

No symptoms. Routine cardiac ultrasound screening revealed unexpected findings.

Patient Data

Age: 55 years
Gender: Female
ct
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Careful examination revealed cor triatriatum. A fibrous membrane divides the left atrium into a pre-chamber receiving the pulmonary veins and a post-chamber connected to the appendage and the mitral valve. The membrane shows a large defect.

Chiari's network is in the right appendage.

Left persistent superior vena cava.

Annotated image
4ch-chamber
4-chamber
Short axis
left atrium
Long axis
view
Aortic
valve
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The 4-chamber view shows the fibrous membrane within the left atrium with the large communicating defect further upwards also visible in the short axis view.

The vertical long axis allows another view of the pre-chamber and post-chamber.

A bicuspid aortic valve, type 0 (secondary screenshot) without coarctation.

Case Discussion

Cor triatriatum is a rare congenital anomaly which may be symptomatic if the defect is narrow and obstructs blood flow through the left atrium. In this case, a large opening in the membrane allowed this middle-aged patient to remain asymptomatic.

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