Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . No focal consolidation , edema , effusion , or pneumothorax . Mild elevation of left hemidiaphragm is similar the prior exam . The heart is normal size . Aortic knob calcifications are mild . No acute osseous abnormality . There is nonspecific gaseous distension of bowel loops in the partially imaged upper abdomen .
    OUTPUT:
    
No focal pneumonia .