Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . The heart size is top normal . The mediastinal and hilar contours are unremarkable . There is crowding in the bronchovascular structures . Additionally , a patchy opacity is noted within the right lower lobe . This is nonspecific and could reflect atelectasis though infection is not excluded . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy opacity in the right lower lobe . Findings are nonspecific and could reflect atelectasis though infection is not excluded .