2024年11月23日 · An azygos lobe forms when the right posterior cardinal vein, one of the precursors of the azygos vein, fails to slide medially over the apex of the lung and instead penetrates it, carrying with it two double pleural layers that invaginate into the superior portion of the right upper lobe 2.

2023年8月2日 · Accessory fissures of the lung usually occur at the borders of bronchopulmonary segments. They are common normal variants but are less commonly seen on imaging. Some of the more common accessory fissure include 1: azygos fissure: most commonly seen accessory fissure; inferior accessory fissure; superior accessory fissure; left horizontal fissure

2024年10月14日 · The azygos vein is a unilateral vessel that ascends in the thorax to the right of the vertebral column, carrying deoxygenated blood from the posterior chest and abdominal walls. It forms part of the azygos venous system .

2024年10月22日 · Each lung has an oblique fissure, also known as the major fissure, that separates the upper lobes from the lower lobes. It extends from the level of the T4/T5 vertebrae posterosuperiorly to the hemidiaphragms anteroinferiorly and is gently undulating in nature.

2024年6月27日 · The inferior accessory fissure of the lung, also known as Twining's line, divides the medial basal bronchopulmonary segment from the rest of the lower lobe 4.

2024年10月29日 · In most individuals, the right lung is composed of three lobes subdivided into 10 segments and the left is composed of two lobes and eight segments. They are surrounded by the pleura which separates them from the chest wall. See main article: bronchopulmonary segmental anatomy. The lobes of the lungs are also incompletely separated by fissures.

2024年7月23日 · There is some form of segmental symmetry between the right and left lungs, even though the left lung is smaller and only contains two lobes. In general, each lung has 10 segments: the upper lobes contain 3 segments, the middle lobe / lingula 2 and the lower lobes 5.

2021年4月21日 · An azygos arch valve refers to a venous valve at the site of the arch of the azygos vein. They are considered common and are more frequently seen at CT when high contrast material injection rates and right arm injections are used 2 .

An azygos lobe, while not a true accessory lobe, is a common anatomical variant. It is demonstrated in the right upper zone of frontal chest x-rays and presents as a linear density coursing towards the right hilum with a typical 'teardrop' at its...

2024年10月6日 · The azygos vein receives the lower eight right-sided posterior intercostal veins, as well as the bronchial veins from the right lung. It is joined by the right superior intercostal vein superiorly. Although there is much variability, the azygos vein receives the accessory hemiazygos vein and the hemiazygos vein at the level of T8 and T9 ...