Pneumothorax CT manifestations, we know that there is a potential gap between the lungs and the chest wall in normal individuals, but normally, this gap or cavity is under negative pressure. This negative pressure ensures that the lungs are pressed tightly against the chest wall and the pleura, also containing a certain amount of lubricating fluid which allows for movement during inhalation without excessive friction causing pain. However, if due to some reason, such as a burst large or small pulmonary bullae, air enters this potential cavity or the pleural space, it is referred to as pneumothorax. Moreover, on a CT scan, it is distinctly visible that part of the chest cavity shows an area devoid of air-containing lung structures, indicating the absence of normal lung in this region. Normally on CT, a healthy lung appears like a sponge, so this phenomenon reveals sponge-like tissue, referred to as lung texture. But when air enters, the pressure from the air can compress the lung, causing it to collapse, similar to a deflating balloon. In addition, part of the CT imaging presents as dark areas around the periphery where lung textures are absent or cavities appear, referred to as pneumothorax.