Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a focal opacity at the right lung base obscuring the right heart border . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . There is no pleural effusion or pneumothorax . Included upper abdomen is unremarkable . Osseous structures are grossly intact .
    OUTPUT:
    
Opacity at the right lung base may represent pneumonia in the appropriate clinical setting .