right lung has two fissures, oblique fissure and horizontal fissure
Each lobe has its own visceral pleural covering.
The left lung is divided into two lobes, upper and lower, by the oblique (major) fissure.
Only the horizontal fissure is commonly seen on a frontal chest X-ray.
horizontal fissure (right) is often seen on a normal frontal view
oblique fissures may be seen on a normal lateral view
separated by the horizontal and oblique (or major) fissures
usually no horizontal fissure on the left
horizontal fissure separates the right upper lobe from the right middle lobe
as a thin line running roughly horizontally from the edge of the lung towards the right hilum
oblique (major) fissures overlie each other on a lateral view and are not always seen in entirety
the lower end is usually seen most clearly
horizontal fissure is not seen at all on this lateral image
most common accessory fissure visible on a chest X-ray
azygos vein passes horizontally along the right side of the mediastinum
azygos vein appears to pass through the lung and is surrounded by both parietal and visceral pleura
azygos fissure therefore consists of four layers of pleura, two parietal layers and two visceral layers
the head is the azygos vein and the tail the azygos fissure
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