Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is airspace opacification in the lateral right lower lobe , consistent with history of pneumonia , the lungs are otherwise clear without effusion or pneumothorax . The cardiac silhouette is normal in size , the mediastinal contours are normal . The pulmonary vasculature appears normal . There is no osseous abnormality .
    OUTPUT:
    
Airspace opacity in the lateral right lower lobe , consistent with known pneumonia .