In blunt chest trauma, which signs suggest rib fracture with underlying contusion?

In blunt chest trauma, which signs suggest rib fracture with underlying contusion?

• A. Global hyperresonance with no tenderness.
• B. Localized chest tenderness and crepitus, guarding; hypoxia and tachypnea; imaging may show contusion or alveolar hemorrhage and rib fracture.
• C. Absence of tachypnea.
• D. Only chest pain without other signs.

Answer: (B)