Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes result in bronchovascular crowding . There is no focal consolidation , pleural effusion or pneumothorax . Mild left basilar atelectasis is noted . Heart size is normal . Aortic tortuousity is unchanged . Hilar contours are stable .
    OUTPUT:
    
No pneumonia , edema or effusion .