Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to chest radiographs from ___ , opacification within left perihilar region and left upper lung has worsened . No new focal consolidations . The right lung is clear . No pleural effusion . No pneumothorax . No central vascular congestion or overt pulmonary edema . Mediastinal and hilar contours are stable . Heart is top - normal in size , unchanged . Small hiatus hernia is present .
    OUTPUT:
    
Worsening opacification in the left perihilar region / left upper lobe is consistent with pneumonia . Radiographs corresponding to provided history should be obtained and uploaded to PACS for comprehensive evaluation , if possible .