Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Streaky left perihilar opacity appears similar to prior CT exam and may reflect prior radiation treatment . There is bibasilar atelectasis with a probable component of scarring . No convincing signs of pneumonia . No pleural effusion or pneumothorax . The heart size is difficult to assess appears grossly stable . Mediastinal contour is normal . No definite bony abnormalities are seen . Clips are partially imaged in the right upper quadrant .
    OUTPUT:
    
Streaky perihilar and lower lung opacities likely reflect scarring and or atelectasis . No convincing signs of pneumonia .