Surgical treatment of anomalous right upper lobe pulmonary vein obstruction caused by compression between pulmonary artery and trachea: a case report.

The normal anatomical course of right upper lobe pulmonary vein involves drainage anteriorly to the pulmonary artery, ultimately reaching the left atrium. However, anomalies can occur with the most common variation involving the convergence of the right upper lobe pulmonary vein with the superior vena cava. In a rare pulmonary vascular malformation, the anomalous right upper lobe pulmonary vein takes a path between the right pulmonary artery and right main bronchus