Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are normal . Note is made of a faint opacity at the left lung base and projecting over the spine on the lateral view , concerning for developing infection . Remainder of the lungs are otherwise clear of focal consolidation , pleural effusion or pneumothorax . Cardiomediastinal contours are normal . No acute osseous abnormalities identified .
    OUTPUT:
    
Left lower lobe opacity , concerning for developing infection .