Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , which results in vascular crowding and apparent enlargement of the normal - sized heart . Streaky opacities in the left lower lobe . The mediastinal and hilar structures are unremarkable . Cholecystectomy clips are appreciated .
    OUTPUT:
    
Low lung volumes with streaky opacity in the left lung base which is likely atelectasis , although , pneumonia can not be excluded .