Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal contours are unremarkable . There is redemonstration of right upper lobe atelectasis with interval increase in aeration . There is slight deviation of the trachea to the right . Minimal interstital lung markings at lung bases could represent atelectasis or focal scarring . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
Partial right upper lobe collapse of unknown chronicity . In the abscene of prior surgical history or prior history for volume loss , consider CT to exclude a hilar mass . These findings were discussed with Dr . ___ by Dr . ___ ___ telephone on ___ at 3 : 15 PM , at time of discovery .