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Azygos lobe

In human anatomy, an azygos lobe is a rare congenital variation of the upper lobe of the right lung. Embryologically, it arises from an anomalous lateral course of the azygos vein  in a pleural septum within the upper lobe. As it has NO bronchi, veins and arteries of its own, it is not a true, or even accessory, pulmonary lobe, but rather an anatomically separated part of the upper lobe. It is usually an incidental finding on chest x-ray or computed tomography and is as such not associated with any morbidity but can cause technical problems in thoracoscopic procedure.

Azygos lobe on chest x-ray. Arrowheads show the delineation of the lobe. Arrow points to the azygos vein.
Azygos lobe on chest x-ray. Arrowheads show the delineation of the lobe. Arrow points to the azygos vein.

Azygos lobe in axial computer tomography. Arrow on azygos vein.
Azygos lobe in axial computer tomography. Arrow on azygos vein.

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