Illustrated Encyclopedia of Human Anatomic Variation: Opus II: Cardiovascular System
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
The vena azygos may be displaced outward, so that, instead of curving over the roof of the lung, it may make a deep fissure in the upper part of the right lung, which is then called the azygos lobe. It can be identified radiographically because it has the shape of an inverted "teardrop" or comma.
Authors' note: Data from 323,641 roentgen examinations indicate an incidence of about 0.57%.
Redrawn from Anson, B.J., Siekert, R.G., Richmond, TE. and W.E. Bishop. The accessory pulmonary lobe of the azygos vein. Q. Bull. Northwestern University Medical School 24:285-290, 1940.
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