Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Subtle , vague , patchy opacities are noted within the right lower lobe and left mid lung field , likely within the left upper lobe , not seen on the prior chest radiograph , and concerning for an infectious process . No pleural effusion or pneumothorax is seen . No acute osseous abnormalities are present .
    OUTPUT:
    
Vague patchy opacities in the left upper lobe and right lower lobe concerning for infection . Followup radiographs after treatment are recommended to ensure the resolution of this finding .