Definition
A small accessory lobe sometimes found on the upper part
of the right lung; separated from the rest of the upper lobe by a
deep groove lodging the azygos vein, of little clinical
significance.
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Radiographic Appearance
The azygos lobe appears starting in a teardrop shape at
around the level of T5 to the right of the midline as a pale line
curving outward and upward and then back in to meet the root of the
neck, the line is the infolding of the pleura.
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Pathology
Abnormal fissures and lobes of the lungs are common and usually
insignificant. A lobe of the azygos vein appears in the right lung
in about 1 percent of people. It develops when the apical bronchus
grows superiorly medial to the arch of the azygos vein instead of
lateral to it. As a result, the azygos vein comes to lie at the
bottom of a deep fissure in the superior lobe of the right lung.
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Treatment:
No treatment is required |
Image 1 Azygos
lobe on a PA chest radiograph
Image 2 Azygos Lobe on CT
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