<prompt> Answer this question truthfullyWhich complication of blunt chest trauma is identified by unilateral decreased breath sounds and patchy, irregular alveolar infiltrate on imaging within 24 hours of the injury?  <response>: <reason> Pulmonary contusion is the blunt chest trauma complication that is characterized by unilateral decreased breath sounds and patchy, irregular alveolar infiltrate on imaging within 24 hours of the injury. 