Cor triatriatum

Case contributed by Dr Vincent Tatco


Child with cardiomegaly and shortness of breath.

Patient Data

Age: 1
Gender: Female

CT demonstrates a membrane dividing left atrium into a proximal chamber, containing the pulmonary venous confluence, and a distal "true" left atrium, which contains the left atrial appendage.

An anomalous vein drains the atelectatic left upper lobe of the lung and joins the left brachiocephalic vein.

The pulmonary arteries, right ventricle and right atrium are dilated.

Annotated image

Annotated CT image showing an obstructing fibromuscular membrane separating the left atrium into proximal and distal chambers.

Case Discussion

This is an intraoperatively confirmed case of cor triatriatum with partial anomalous pulmonary venous return (left upper lobe).

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Case information

rID: 41973
Published: 30th Dec 2015
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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