Anomalous pulmonary venous drainage of the left upper lobe shown by CT scans.

Isolated anomalous drainage of the left superior pulmonary vein into the left brachiocephalic vein was shown on computed tomographic (CT) scans. The CT findings include a vertical vein lateral to the aorticopulmonary window and aortic arch that terminates in the left brachiocephalic vein. Features that differentiate this entity from left superior vena cava, anomalous left brachiocephalic vein, and superior intercostal vein are discussed.