Unusual finding of cor triatriatum in a newborn with hypoplastic left heart syndrome

Cor triatriatum is a rare anomaly in which the left atrium is partitioned i nto 2 distinct chambers with a variable degree of obstruction to left atria l inflow. This anomaly often occurs in isolation but can occur in combinati on with other cardiac lesions. The association of cor triatriatum. with hyp oplastic left heart syndrome has not been reported. We describe a newborn w ith hypoplastic left heart syndrome who also had the unusual finding of cor triatriatum sinistrum.