Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased retrocardiac opacification is compatible with left lower lobe pneumonia . There is no pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is within normal limits . There is stable moderate to severe scoliosis .
    OUTPUT:
    
Left lower lobe pneumonia .