Absence of azygos vein with persistence of left vitelline vein

Bennett Futterman ； Melinda Danowitz ； Nikos Solounias

《Edorium Journal of Anatomy and Embryology》 3期 (2016/01) Pp. 63-66

https://doi.org/10.5348/A04-2016-17-CR-9

摘要

Anatomical anomalies often reflect congenital malformations or developmental defects. We describe a cadaver in which the azygos vein was absent, coupled with the presence of an accessory atrio-hepatic venous connection that we attribute to persistence of the embryologic left vitelline vein. The formation of the azygos vein from the supracardinal vein, and the regression of the left vitelline vein, both occur around seventh week of development. The left vitelline vein connects the left and quadrate lobes of the liver to the developing heart. Although the absence of the azygos vein and adult persistence of the left vitelline vein have been reported independently, this is the first description of these two variants in combination.

關鍵字

Azygos ； Congenital variation ； Left hepatic vein ； Vitelline