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Reports successful surgical excision of an obstructing right atrial membrane causing cyanosis in a newborn, highlighting a rare congenital etiology.
Remnants of the right valve of the sinus venosus, which fail to regress may present as an obstructing membrane within the right atrium as a very rare congenital anomaly. When associated with an atrial septal defect, primary cyanosis may occur due to a large right-to-left shunt. We report on a 1-week old girl with a pseudo-cor triatriatum dexter and immediate cyanosis after an uncomplicated birth. She was successfully treated with surgical excision of the obstructing membrane.
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Yerebakan et al. (2014) studied this question.
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