Figure 9a. Common (conjoined) veins. (a) VR image (posteroanterior epicardial view) from nongated multi-detector row CT shows a right common vein (RCV). LI = left inferior pulmonary vein, LS = left superior pulmonary vein. (b) VR image (right posterior oblique epicardial view) from nongated multi-detector row CT performed in a different patient shows a left common vein (LCV). RI = right inferior pulmonary vein, RS = right superior pulmonary vein. Both right and left common veins are normal variants of the pulmonary venous anatomy, but the latter occurs much more frequently than the former.