Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed . Compared to the prior study , there has been slight interval increase in left lower lung linear opacities . The heart size is unchanged and there is no evidence of vascular congestion , pleural effusion , or pneumothorax . Elevation of the right hemidiaphragmatic contour is unchanged . The bones and soft tissues are unchanged .
    OUTPUT:
    
Slight interval increase in left lower lobe linear opacities that are most likely atelectasis but in the proper clinical setting could represent pneumonia .