Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette is normal . There is no pleural effusion or pneumothorax . There is a subtle opacity at the left lung base , seen anteriorly on lateral view . There is a mild S - shaped scoliosis of the thoracic lumbar spine .
    OUTPUT:
    
Left lower lobe pneumonia .