[Mixed type of total anomalous pulmonary venous return: a rare pattern of pulmonary venous drainage]

The occurrence of multiple drainage sites in total anomalous pulmonary venous return (TAPVR) has important implication in preoperative diagnosis and surgical treatment. We report a rare pattern of pulmonary venous drainage with the right upper pulmonary vein draining into the innominate vein and the other three pulmonary veins into the portal vein (Ib + III type). The preoperative diagnosis was made by echocardiography and confirmed by angiography. In operation, an anastomosis was made between the common pulmonary vein and the left atrium through posterior approach, but the right upper pulmonary vein was left uncorrected because the anomalously draining blood flow of a single pulmonary vein was about 20% of total pulmonary blood flow. The postoperative course was uneventful, however, the long-term follow-up is mandatory because of the right upper pulmonary vein being left uncorrected.