Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The mediastinal contours are unremarkable . There is crowding of the bronchovascular structures , likely the result of low lung volumes . Additionally , patchy bibasilar airspace opacities likely reflect atelectasis . Elevation of the right hemidiaphragm is noted . There is no focal consolidation , pleural effusion or pneumothorax . No acute osseous abnormalities identified .
    OUTPUT:
    
Low lung volumes which limit the assessment of the lung bases . Probable bibasilar atelectasis . Elevation of the right hemidiaphragm .