Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A substantial right perihilar nodule has substantially improved since the prior radiographs with an area of cavitation seen in lieu of a substantial solid nodule . Other nodules also appear somewhat less distinct including a cavitating nodule in the right upper lobe which seems surrounded perhaps by slightly less opacity than before . There are no pleural effusions or pneumothorax . Mild - to - moderate degenerative changes are similar throughout the thoracic spine .
    OUTPUT:
    
Smaller lung nodules since the prior radiographs with increased cavitation .