Hemothorax is most commonly unilateral or bilateral?

Hemothorax is most commonly unilateral or bilateral?

• A. Unilateral
• B. Bilateral
• C. Equally common
• D. Depends on etiology

Answer: (A)

Bleeding into the pleural space from chest trauma or lung injury typically collects on the side where the injury occurred, because the source of the bleed (such as a rib fracture with intercostal vessel tear, a pulmonary laceration, or a thoracic vascular injury) is usually unilateral. Therefore, a hemothorax is most often found on one side. Bilateral hemothorax is relatively uncommon and tends to occur with very severe bilateral chest trauma, diffuse coagulopathy, or extensive surgery where both pleural spaces are exposed to bleeding. While certain etiologies can theoretically cause bilateral involvement, the typical pattern in trauma and most pathologies is unilateral, making unilateral the best answer.

Bleeding into the pleural space from chest trauma or lung injury typically collects on the side where the injury occurred, because the source of the bleed (such as a rib fracture with intercostal vessel tear, a pulmonary laceration, or a thoracic vascular injury) is usually unilateral. Therefore, a hemothorax is most often found on one side. Bilateral hemothorax is relatively uncommon and tends to occur with very severe bilateral chest trauma, diffuse coagulopathy, or extensive surgery where both pleural spaces are exposed to bleeding. While certain etiologies can theoretically cause bilateral involvement, the typical pattern in trauma and most pathologies is unilateral, making unilateral the best answer.