Azygos lobe on chest X-ray. Arrowheads show the delineation of the lobe. Arrow points to the azygos vein. In human anatomy, an azygos lobe is a normal anatomical variation of the upper lobe of the right lung. [1] It is seen in 0.3% of the population. [2]

Nov 23, 2024 · An azygos lobe is a normal variant that develops when a laterally displaced azygos vein creates a deep pleural fissure in 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 or corresponding bronchopulmonary segment 1 .

Feb 26, 2025 · Azygos Lobe on CT Scan: A Clearer Picture. A CT scan provides a much more detailed view of the azygos lobe compared to an X-ray. On a CT scan, the azygos fissure appears as a deep groove, and the azygos vein can be seen running within it. The lung tissue inside the azygos lobe looks just like the rest of the lung, confirming that it is normal ...

The azygos lobe is formed due to incomplete medial migration of the right posterior cardinal vein, one of the precursors of the azygos vein, into the apex of the lung instead of normal migration over it during embryogenesis. 2,3,6 The abnormal azygos migration results in a classic para-tracheal shadow on x-ray along with several other key x-ray ...

Jul 24, 2023 · An azygos lobe is a rare, anatomical variant of the upper lobe of the right lung found in approximately 1% of anatomic specimens and 0.4% of chest radiographs [1]. It forms during embryological development when the posterior cardinal vein, the precursor of the upper thoracic segment of the azygos vein, erroneously migrates through the upper ...

Jan 1, 2018 · An azygos lobe is a rare normal anatomic variant of the right upper lobe, first described by Heinrich Wrisberg in 1778 [1]. Its prevalence varies from 0.4% on chest radiograph to 1.2% on high resolution CT scans.

INTRODUCTION: This case introduces an incidental discovery of an azygos lobe, a seldom-encountered imaging phenomenon. The following discussion provides a concise overview of the anatomical structure and explores its medical implications.

The right azygos lobe (lobus venae azygos) is an anatomical variant present in the upper lobe of the right lung, separated from the rest of the lung by a deep groove called an azygos fissure, which consists of the azygos vein and four layers of …

In this paper we describe the normal appearance of the azygos lobe on conventional radiography and CT, presenting variants that may simulate pathology on the chest radiograph. We describe the signs that allow identification of such variants and the role of CT in explaining the findings and excluding a pathological process.

Jul 24, 2023 · An azygos lobe is a rare, anatomical variant of the upper lobe of the right lung found in approximately 1% of anatomic specimens and 0.4% of chest radiographs [1].