Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unremarkable . Increased interstitial opacities are noted predominantly within the lung bases , not significantly changed from prior , with an area of linear atelectasis noted in the right lower lobe . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Increased interstitial markings within the lung bases which appear relatively similar when compared to the prior study , and may reflect chronic changes . Subsegmental atelectasis in the right lower lobe .