What does azygos fissure mean?
azygos fissure is a developmental abnormality caused by the right posterior cardinal vein (one of the precursors of the azygos vein) failing to migrate over the right lung apex, and instead penetrating and grooving it.
Does everyone have an azygos fissure?
In human anatomy, an azygos lobe is a normal anatomical variation of the upper lobe of the right lung. It is seen in 0.3% of the population.
Is azygos fissure rare?
The azygos lobe is a rare anatomical variant of the lung, first recognized by Heinrich August Wrisberg in 1777 [9]. It is encountered in approximately 1% of anatomical specimens, 0.4% of chest radiographs and 1.2% of high-resolution CT (HRCT) thorax scans [1, 2].
What is a fissure in the chest?
The left lung is divided into two lobes, upper and lower, by the oblique (major) fissure. The right lung has two fissures, oblique fissure and horizontal fissure, which separate the lung into three lobes – upper, middle, and lower. Each lobe has its own visceral pleural covering.
Is an azygos fissure bad?
The azygos lobe, also commonly referred to as an accessory lobe of the azygos vein, is located at the apicomedial portion of the right lung and is separated from the remainder of the upper lobe by a fissure. It usually has no significant clinical implications and is an incidental finding in radiographic studies.
Is an azygos fissure normal?
The azygos vein, located at the bottom of the fissure, is visible as a teardrop-shaped opacity [2]. The incidence of this normal variant is estimated between 0.4% and 1.2% [2; 4]. Accessory pulmonary fissures, including the azygos fissure, are known to affect up to 50% of the population.
Is Azygos fissure normal?
What is the meaning of azygos?
: not being one of a pair : single an azygos vein.
Can Azygos fissure cause problems?
An untreated azygos vein aneurysm can predispose the patient to the risk of rupture, thrombosis, or pulmonary embolism. As in all lung tissue, some pathologic processes can originate in the azygos lobe, including bullous or bronchiectatic changes, pneumonia, and tuberculosis.
What causes Azygos fissure?
A convex shaped fissure is created by the course of the vein bearing towards the medial side of the right lung to join with the superior vena cava. Its formation is the result of an unusual embryogenic migration of the posterior cardinal vein, which is a precursor of the vena azygos.
What is the azygos fissure?
azygos fissure is a developmental abnormality caused by the right posterior cardinal vein (one of the precursors of the azygos vein) failing to migrate over the right lung apex, and instead penetrating and grooving it. When present, the upper part of the right upper lobe tucks medially behind the azygos arch, and the azygos vein and arch lie at
What are the accessory fissures of the chest?
oblique accessory fissures azygos fissure superior accessory fissure inferior accessory fissure left horizontal fissure vertical fissure line normal chest x-ray appearance of the diaphragm flattening of the diaphragm
Which side of the chest is the azygos vein located?
Because the azygos vein is a right-sided structure, this accessory fissure is only ever seen on the right side of the chest
Where is the azygos lobe on a chest radiograph?
Plain radiograph. The azygos lobe is usually well seen on the chest radiograph, where it is limited by the azygos fissure , a fine, convex (relative to the mediastinum) line that crosses the apex of the right lung.