After a fall from a tree, a 15-year-old presents with dyspnea, guarding, and paradoxical chest movement on the right. Which chest injury should you suspect?

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Paradoxical chest movement after blunt trauma is the hallmark sign of a flail chest. When multiple adjacent ribs are fractured in two or more places, a segment of the chest wall becomes detached and moves oppositely to the rest of the chest during breathing. Inhale: the intact chest expands while the free segment pulls inward; exhale: the segment bulges outward. This abnormal movement reflects significant chest wall instability and impaired ventilation, which explains the dyspnea and guarding. While rib fractures or pulmonary contusion can cause pain and breathlessness, they do not produce this opposite-motion of a chest wall segment. In the field, provide oxygen, support ventilation as needed, and transport promptly with careful airway and breathing management.