Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a subtle opacity in the right medial lower lobe which is new from the prior two radiographs . No other focal consolidation is identified . There is no pulmonary edema , pleural effusion or pneumothorax . The lungs are mildly hyperinflated , similar to priors . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Subtle right lower lobe opacity ; while this could be atelectasis , a pneumonia is difficult to completely exclude .