Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is interval development of left lower lobe opacification consistent with pneumonia . No pleural effusion or pneumothorax is present . Stable cardiomediastinal silhouette . Unchanged DISH along the thoracic spine .
    OUTPUT:
    
Left lower lobe pneumonia . Recommend followup radiograph in ___ weeks after treatment to ensure resolution .