Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a focal opacity in the left lower lobe likely suggestive of an infiltrative process . No other focal opacities are seen . The heart size is normal . The hilar and the mediastinal contours are unremarkable . The visualized osseous structures are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left lower lobe pneumonia . Recommend follow up after treatment in 1 month .