Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a focal consolidation in the left lower lobe containing air bronchograms . There is no pleural effusion or pneumothorax . The heart size is mildly enlarged , unchanged . The left - sided pacer leads terminate in the right atrium and ventricle .
    OUTPUT:
    
Left lower lobe pneumonia . Recommend four week follow - up imaging .