Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle opacification within the left lower lung , localized to the lower lobe on the lateral is concerning for early / developing pneumonia . No other focal consolidations . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Subtle opacification within the left lower lobe is concerning for early / developing pneumonia .