Fig. 4. Reformatted CT image of chest, in oblique coronal plane, of 66 year old male with catheter-related thrombosis (*) of left brachiocephalic vein (short white arrow). Level shown is through ascending aorta and innominate artery. At pericardial attachment to ascending aorta (black arrowhead), there is continuity between pericardial vein (long white arrow) and longitudinal vessel (long black arrow) along intrapericardial portion of ascending aorta near aortopulmonary groove (white arrowhead). Vessel passes posterior to right coronary artery (curved black arrow) before draining into right atrial appendage (not shown). Pericardial vein in question was branch of venous plexus joining left (curved white arrow) and right inferior thyroid veins. P = pericardium