Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are again notable for subtle right middle lobe opacity . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . Hypertrophic changes are seen in the spine without acute osseous abnormalities .
    OUTPUT:
    
Subtle persistent right middle lobe opacity similar compared to prior , could represent resolving infection . Follow - up to document resolution in several weeks is suggested .