Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . The pulmonary vasculature is not engorged . Patchy left lower lobe opacity is concerning for pneumonia . No pleural effusion or pneumothorax is seen . Remote left - sided rib fractures are again seen .
    OUTPUT:
    
Left lower lobe patchy opacity concerning for pneumonia . Followup radiographs after treatment are recommended to ensure resolution of this finding .