The lower image is 7 days earlier.20 year old male with poly trauma with cervical cord injury and quadriparesis, underwent surgery 3 days later he worsened and needed needed mechanical ventilation due to resp.insufficiency. The upper image is the new X ray. What is your diagnosis and what will be the next step ?

In view of the history this is most likely a collapse consolidation .Bronchoscopy is next choice intervention.