Azygos venous system anatomy on CT pulmonary angiography

Case contributed by Dr Henry Knipe


Pleuritic chest pain for days ?PE.

Patient Data

Age: 35
Gender: Male

No pulmonary embolus. 

Contrast is seen to reflux in the azygos system including the left supreme intercostal vein, azygos vein, hemiazygos vein and accessory hemiazygos vein. This was thought to occur because the patient started to strain during the scan, increasing intra-abdominal pressure. 

Case Discussion

Unusual reflux of contrast into the azygos system, highlighting its anatomy on the CTPA study. 

This case has a common configuration of a common trunk of the hemiazygos and accessory hemiazygos draining into the azygos vein. It also demonstrates the extensive communication with the vertebral venous plexus as well as the communication between the accessory hemiazygos and the left superior intercostal vein (which is more common than no communication). 

PlayAdd to Share

Case information

rID: 25928
Case created: 16th Nov 2013
Last edited: 13th Jul 2017
Systems: Vascular, Chest
Inclusion in quiz mode: Excluded

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.