CTICasesCor Triatriatum Dexter and Sinister
Imaging findings
In the first patient, cardiac MRI demonstrates a fibromuscular accessory membrane dividing the right atrium, consistent with cor triatriatum dexter. In the second patient, a four-chamber cine MRI sequence reveals a similar accessory membrane partition within the left atrium, consistent with cor triatriatum sinister.
Key takeaways
Cor triatriatum is a rare congenital cardiac anomaly where an accessory membrane divides an atrium into two chambers. Cor triatriatum sinister (left atrium) is more common, while cor triatriatum dexter (right atrium) is extremely rare. When the membrane is non-restrictive, these anomalies are often hemodynamically insignificant and discovered incidentally in adulthood.
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