Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart appears at least borderline enlarged . Within the limitations of technique , the mediastinal and hilar contours are probably within normal limits . Opacification is fairly confluent over the lateral left lower lung suggesting pneumonia , or potentially aspiration in the appropriate setting ; otherwise , lungs appear clear . There is no definite pleural effusion or pneumothorax .
    OUTPUT:
    
Focal opacity in the left lower lung suggesting pneumonia , potentially aspiration in the appropriate setting .