Which term describes air in the pleural space on a chest radiograph?

Which term describes air in the pleural space on a chest radiograph?

• A. Infiltrate
• B. Pneumothorax
• C. Edema
• D. Atelectasis

Answer: (B)

Air in the pleural space on a chest radiograph is called pneumothorax. This occurs when the pleural layers separate and air fills the space between them. On imaging you’ll see a distinct visceral pleural line where lung markings stop; beyond that line no markings are present because air fills the space. The lung on the affected side may appear collapsed and the hemithorax can look more lucent. In upright films, the air tends to collect at the top, so a visible pleural line with peripheral darkness is typical. In a more severe case, a tension pneumothorax can shift the mediastinum, but the defining idea remains air in the pleural space. Other terms describe different problems within the lung itself. Infiltrate refers to a process within the lung parenchyma such as infection or inflammation. Edema is fluid buildup in the lungs, often causing diffuse haziness or perihilar markings. Atelectasis is collapse of lung tissue, leading to volume loss and linear or wedge-shaped opacity.

Air in the pleural space on a chest radiograph is called pneumothorax. This occurs when the pleural layers separate and air fills the space between them. On imaging you’ll see a distinct visceral pleural line where lung markings stop; beyond that line no markings are present because air fills the space. The lung on the affected side may appear collapsed and the hemithorax can look more lucent. In upright films, the air tends to collect at the top, so a visible pleural line with peripheral darkness is typical. In a more severe case, a tension pneumothorax can shift the mediastinum, but the defining idea remains air in the pleural space.

Other terms describe different problems within the lung itself. Infiltrate refers to a process within the lung parenchyma such as infection or inflammation. Edema is fluid buildup in the lungs, often causing diffuse haziness or perihilar markings. Atelectasis is collapse of lung tissue, leading to volume loss and linear or wedge-shaped opacity.