Fig. 2
From: Anomalous pulmonary venous drainage: a pictorial essay with a CT focus
Normal pulmonary venous anatomy and normal variants. 3D CT reconstructions of the left atrium and pulmonary veins, posterior views. a Normal pulmonary venous anatomy. (1) Left superior pulmonary vein, (2) Left lower pulmonary vein, (3) Right superior pulmonary vein, (4) Right inferior pulmonary vein. b Normal variant right middle pulmonary vein (arrowhead). c Single conjoined left pulmonary vein (asterisk). d Anatomical variant with conjoined ostium (black arrow) of the left inferior pulmonary vein (2) and right inferior pulmonary vein (4)