On an X-ray, one side of the lung field is divided from the periphery to the hilum into outer, middle, and inner zones.
Under normal circumstances, the inner lung zone and the middle lung zone contain lung textures, which occupy a large area of the lung—up to ninety percent—it can be said they basically represent the lung. Lung textures are the projections formed by the lung's blood vessels, lymphatic vessels, and bronchi under the X-ray. Anatomically, we know that these structures of the lung are like branches extending from a large tree, lines interweave and overlap. The imagery presented in radiology is similar, like the surface texture of an object, thus called lung texture.
Once pneumothorax occurs, the lung is compressed, the inner lung zone and middle lung zone inevitably shift downwards and inwards, and in radiology, it can show the compression of visible lung textures.
