The pulmonary veins usually drain into the left atrium, with the superior veins located in front and below the right pulmonary arteries.
An extremely rare case of pulmonary vascular anomaly was found in a patient with unusual chest pain, where the right superior pulmonary vein ran behind the right pulmonary artery and was compressed between it and the right main bronchus.
Coronary CT angiography successfully identified the anomaly in the pulmonary vein, but the patient's coronary arteries appeared normal.