Chest radiograph of hemopneumothorax due to blunt trauma

Left panel: Supine chest radiograph shows hyperexpansion of the left hemithorax with filter effect and veil-like opacification due to dorsal blood and ventral gas. Right panel: After insertion of chest tubes, the dorsal component of blood has been drained and only the pneumothorax remains. The contused lung is too rigid and noncompliant to collapse completely.