Abstract
Background: The azygos lobe is a rare variation of the right upper lobe of the lung, and prevalence of it in the general population varies widely between 0.1% and 8%. It can be diagnosed easily by thoracic computed tomography.
 Objective: In this study, by thoracic computed tomography, azygos lobe frequency and associated variations were evaluated.
 Materials and Methods: In this study, 5854 thoracic computed tomography with and without contrast applied for patients in the Kars Harakani State Hospital Chest Diseases Polyclinic between January 2014 and January 2018 were screened retrospectively.
 Results: A total of 5854 thoracic computed tomography showed that frequency of azygos lobe was 1.09%. Out of 64 patients with azygos lobe, 36 (56.25%) were male and 28 (43.75%) were female. Bovine artery was found in 8 (12.5%) cases, right-left carotid artery common origin in 3 (4.68%) and aberrant right subclavian artery in 1 (1.56%).
 Conclusion: The detected azygos lobe frequency is similar to literature and the most common accompanying variation is bovine artery.
 J Enam Med Col 2019; 9(3): 177-180
Highlights
The azygos lobe is a congenital variant and occurs in the intrauterine period with the azygos vein passing through the anterior superior lobe of the right lung and it remains adjacent to apical or posterior segment of the upper lobe of the right lung.[1]
The azygos lobe is a rare variation of the right upper lobe of the lung and first described by Heinrich Wrisberg in 1778.2 The frequency of azygos lobe in general population varies between 0.1% and 8%
While the frequency of azygos lobe in lung x-ray is very low (0.4%), the diagnosis can be made by high resolution thoracic computed tomography (CT)
Summary
The azygos lobe is a congenital variant and occurs in the intrauterine period with the azygos vein passing through the anterior superior lobe of the right lung and it remains adjacent to apical or posterior segment of the upper lobe of the right lung.[1]. While the frequency of azygos lobe in lung x-ray is very low (0.4%), the diagnosis can be made by high resolution thoracic computed tomography (CT) .[1,3] The aim of this study was to determine the frequency of azygos lobes detected on thoracic CT scans and to evaluate the coexistence of bovine artery, aberrant right subclavian artery, aortic transposition, dextrocardia, and rightleft carotid artery common origin. The azygos lobe is a rare variation of the right upper lobe of the lung, and prevalence of it in the general population varies widely between 0.1% and 8%. It can be diagnosed by thoracic computed tomography. Conclusion: The detected azygos lobe frequency is similar to literature and the most common accompanying variation is bovine artery
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