This cluster of findings points most strongly to pulmonary contusion , which is essentially a bruised lung after blunt chest trauma . When the lung tissue is injured, bleeding and swelling inside the lung interfere with gas exchange, so the patient can develop dyspnea , hypoxia , rales/crackles , and even hemoptysis . Authoritative trauma references specifically describe pulmonary contusion after blunt chest trauma with hypoxemia as a key sign, and note that patients may present with dyspnea/cough , while severe cases can have rales and bloody sputum or hemoptysis . ( NCBI )
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