Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . The lungs are well expanded . The previously seen focal area of increased density at the right lung base has improved ; however , there is vague , more diffuse , subtle increased density at the right lung base , which may reflect an ongoing infectious process . The left lung is essentially clear . Multiple healed rib fractures of the left upper posterior ribs are again noted as well as chronic abnormalities of the right posterior rib 6 . The upper abdomen is unremarkable .
    OUTPUT:
    
Persistent subtle vague increased density at the right lung base , which may indicate a residual consolidation .