Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An ill - defined patchy opacity at the retrocardiac region appears similar to the recent prior study and is concerning for pneumonia in the proper clinical setting . Mild hyperinflation suggesting COPD is unchanged . Cardiomediastinal silhouettes are normal .
    OUTPUT:
    
1 . Patchy retrocardiac opacity is concerning for pneumonia the proper clinical setting , unchanged from the prior study of ___ . 2 . Mild hyperinflation suggests COPD .