Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: On the frontal view only is a subtle opacity in the left lung base without clear correlate on the lateral projection . Given the clinical history , this could reflect an early developing pneumonia . There is no pulmonary edema or or pleural effusions . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Subtle opacity in the left peripheral lung base could reflect an early developing pneumonia .