Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . The heart size is normal . There is crowding of the bronchovascular structures . Otherwise the mediastinal and hilar contours are unremarkable . There is likely atelectasis at the lung bases . No focal consolidation , large pleural effusion or pneumothorax is identified , though the left costophrenic angle is excluded from the field of view . There are no acute osseous abnormalities . Degenerative changes of both glenohumeral joints are noted .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .