What does azygos fissure mean?
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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.
Is 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.
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.
What is fissures in lungs?
A pulmonary fissure is a boundary between the lobes in the lungs. Its segmentation is of clinical interest as it facilitates the assessment of lung disease on a lobar level. This paper describes a new approach for segmenting the major fissures in both lungs on thin-section computed tomography (CT).
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.
What causes an azygos lobe?
The azygos lobe is formed when the right posterior cardinal vein, which is one of the precursors of the azygos vein penetrates the right lung apex, rather than migrating over it. The cardinal vein carries both pleural layers with it, resulting in entrapment of a portion of the right upper lobe.
What is the meaning of azygos?
: not being one of a pair : single an azygos vein.
What causes an 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 are the different types of lungs fissures?
azygos fissure.
How many fissures does the lung have?
The right lung has three lobes and two fissures while the left lung has two lobes and one fissure.
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.
Where is the azygos fissure located?
right lung
It is typically located in the apicomedial portion of the right lung, separated from the rest of the right upper lobe by a visible fissure, termed an azygous fissure. The fissure can be identified as a fine, convex line on a chest radiograph in the para mediastinal portion of the right lung.
What is unusual about the azygos vein?
Azygos vein is the vein that drains the venous blood from the upper part of the posterior abdominal wall and the thoracic wall. It is very important for the reason that it connects the superior vena cava with the inferior vena cava, and it has very few to no valves.
Where does the azygos vein drain into?
superior vena cava
The azygos vein usually originates from the posterior aspect of the inferior vena cava, at the level of the renal veins. It ascends within the posterior mediastinum to the level of T4 before it arches above the right pulmonary hilum. It drains into the superior vena cava just before it pierces the pericardium.
What is the most chronic disease of the lungs?
The two most common chronic respiratory diseases are asthma and chronic obstructive pulmonary disease (COPD). These both affect the airways in the lungs.
What lung has only one fissure?
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.
What is the purpose of the azygos vein?
The azygos vein transports deoxygenated blood from the posterior walls of the thorax and abdomen into the superior vena cava vein.
What part of body does azygos vein drain?
The azygos vein usually arises either from the lumbar azygos vein or from the posterior side of inferior vena cava around the level of renal veins. It passes through the diaphragm, reaches the mediastinum and finally drains into the superior vena cava.
