Ann Anat. 1996 Jun;178(3):273-5.
Partial agenesis of the azygos vein: a case report.
Caggiati A, Barberini F.
Department of Anatomy, Faculty of Medicine, University of Rome La Sapienza, Italy.
In the cadaver of an 86 year old man the inferior segment of the azygos vein could not be found. Furthermore, a normally developed hemiazygos vein drained the right and left intercostal veins from T 10 to T 6. This vessel finally curved towards the right to reach the superior vena cava after having drained the right superior intercostal veins. The left superior intercostal vein ended in a short vessel draining into the left brachiocephalic vein. This condition may be represented in a standard chest radiograph by the so-called "aortic nipple". Agenesis of the azygos vein, suspected because of the presence of this radiological sign, should be confirmed in the living by means of computerized tomography. This can clarify the anatomy of the mediastinal vessels precisely. Embryological pattern of the azygos system accounting for its possible defects is discussed.
PMID: 8712377 [PubMed - indexed for MEDLINE]
Anyone have a chance to read this one in full? I would be interested in the embryological development of the azygous portion. Can the other veins as described compensate for the missing lower portion of the azygous, or was it likely that this gentleman suffered from CCSVI?