DIAGNOSIS
Congenital Azygos Lobe-
FINDINGS
An Azygos lobe fissure is seen on right side. It extends from the lateral aspect of the vertebral body posteriorly, to the right brachiocephalicvein and SVC anteriorly.
DISCUSSION
•An azygos lobe is a rare normal anatomic variant of the right upper lobe, first described by Heinrich Wrisbergin 1778 due to invaginationof the azygosvein and pleura during development in the fetus.
•An azygoslobe is created when a laterally displaced azygosvein creates a deep pleural fissure into the apical segment of the right upper lobe during embryological development.
•It is not a true accessory lobe as it does not have its own bronchus.
•It is important to have a good understanding of the entity, as it can mimic certain pathological conditions like bullae, abscesses or lung masses. It is also important in preparation for surgical procedures.
