“…Partial anomalous pulmonary venous return occurs in approximately 15%-25% of cases of cor triatriatum [3,6] . Of these, abnormalities of the left pulmonary veins occur more frequently than those of the right [2,3,9,10] . In patients with cor triatriatum, isolated right-sided anomalous pulmonary venous drainage is uncommon [1,7] .…”