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.

What does azygos fissure mean?

The azygos fissure extends from the lateral aspect of the vertebral body posteriorly, to the right brachiocephalic vein and superior vena cava anteriorly. This consists of two layers of parietal pleura and two layers of visceral pleura 4.

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 accessory azygos fissure?

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.

Is Azygos lobe rare?

The azygos lobe is a rare anatomical variant, most often encountered in the right lung [1-2]. Its prevalence in the clinical setting is 0.4%, and 1% in anatomical dissections [1].

What are the fissures of the lungs?

Lung fissures are a double-fold of visceral pleura that either completely or incompletely invaginate lung parenchyma to form the lung lobes. There are numerous accessory fissures that are common anatomical variants.

Is azygos lobe rare?

How many fissures are in the right lung?

The right lung has two fissures, oblique fissure and horizontal fissure, which separate the lung into three lobes – upper, middle, and lower.

What are lung fissures?

Lung fissures are a double-fold of visceral pleura that either completely or incompletely invaginate lung parenchyma to form the lung lobes.

Which lung has azygos lobe?

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].