Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed . Compared to the prior chest radiograph , the left lower lung opacity has improved and likely represent viral bronchitis and / or atelectasis . Hyperinflated lungs and flattened hemidiaphragms are suggestive of chronic obstructive pulmonary disease . Normal heart , pleural and mediastinal surfaces .
    OUTPUT:
    
1 . Improvement in right lower lung lung opacity most likely represents viral bronchitis and / or atelectasis . 2 . Hyperinflated lungs and flattened hemidiaphragms are suggestive of chronic obstructive pulmonary disease