A 28-year-old male presents to the emergency department with acute onset right-sided chest pain and dyspnea after a fall from a motorcycle 2 hours ago. Vital signs: HR 110/min, BP 128/82 mmHg, RR 24/min, SpO₂ 94% on room air. Physical examination reveals decreased breath sounds on the right side with hyperresonance to percussion. A chest X-ray (PA view) is obtained. Which radiological sign, if present on the CXR, would be most specific for pneumothorax?

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