CTICasesCor Triatriatum Sinister
Imaging findings
CT angiography shows an incomplete fibromuscular membrane dividing the left atrium into a superior chamber (receiving the pulmonary veins) and an inferior chamber (containing the left atrial appendage and mitral valve), with a large, non-obstructive fenestration.
Key takeaways
Cor triatriatum sinister is a rare congenital anomaly where the left atrium is partitioned by a membrane. If the membrane is incomplete and has a large fenestration, it is hemodynamically insignificant and is discovered incidentally in adults. It can be missed on routine transthoracic echocardiography.
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