Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . The heart size is mildly enlarged but unchanged . The mediastinal and hilar contours are stable . There is crowding of the bronchovascular structures with no overt pulmonary edema . Linear opacities within the lung bases are progressed from prior and likely reflect atelectasis . No pleural effusion , focal consolidation or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar atelectasis , slightly progressed compared to the prior exam .