Cor triatriatum

Case contributed by Dr Maxim Stalkov


Presented with an episode of pulmonary edema.

Patient Data

Age: 45 years
Gender: Male

Retrospectively gated cardiac CT clearly demonstrates fibromuscular membrane dividing left atrium into a proximal chamber, containing pulmonary venous confluence, and a distal "true" left atrium, which contains the left atrial appendage. Membrane has large fenestration in its lower portion allowing decompression of pulmonary veins.

Case Discussion

Cor triatriatum sinister is a rare congenital cardiac anomaly in which the pulmonary venous confluence is separated from "true" left atrium by fibromuscular septum. Cor triatriatum can persist unrecognized into adult life if large opening or several fenestrations are present. Late onset of symptoms is usually caused by increased pulmonary pressure, development of atrial arrhythmias or mitral valve abnormalities. Nonobstructive cor triatriatum may be an incidental finding.

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Case information

rID: 40128
Published: 8th Oct 2015
Last edited: 6th Jan 2020
System: Cardiac
Inclusion in quiz mode: Included

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