Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new opacity in the left lower lobe concerning for pneumonia given the clinical setting . Stable normal heart size with tortuosity of the thoracic aorta . No pleural effusion or pneumothorax . The right lung is clear .
    OUTPUT:
    
Left lower lobe pneumonia . Recommend followup radiographs after treatment to ensure resolution .