Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There is no definite consolidation , effusion or pneumothorax . There is subtle opacity along the left heart border which is thought to represent overlap of the left hemidiaphragm with the left ninth rib at this level . No effusion or pneumothorax . Cardiomediastinal silhouette is normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No signs of pneumonia .