Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild hyperinflation raising the question of background COPD . Heart size at the upper limits of normal with left ventricular configuration . There is upper zone redistribution , but no overt CHF . No focal infiltrate or effusion is detected . Possible fullness of the right hilum on the frontal view is slightly more pronounced than on the ___ radiograph , but is not confirmed on the lateral view . Mild degenerative changes of the thoracic spine are noted , similar to the prior film .
    OUTPUT:
    
1 . Upper zone redistribution , without overt CHF , unchanged . 2 . No focal infiltrate or consolidation .