Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is top normal . The mediastinal and hilar contours are within normal limits . There is crowding of the bronchovascular structures . Streaky opacities at lung bases could reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities undo present .
    OUTPUT:
    
Low lung volumes which limits assessment of the lung bases . Streaky opacities at the lung bases likely reflect atelectasis .