Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Patchy opacity in the left lower lobe is concerning for pneumonia . The right lung is clear . No pleural effusion or pneumothorax is present . No acute osseous abnormalities identified .
    OUTPUT:
    
Left lower lobe pneumonia . Followup radiographs after treatment are recommended to ensure resolution of this finding .