Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A new focal heterogeneous opacity is seen in the left mid-lung , which in view of the clinical history may be a pneumonia . Additionally , since ___ , the small right pleural effusion is increased and small left pleural effusion is decreased . Mild bibasilar and retrocardiac atelectasis persists . Hyperinflation of the lungs is compatible with patient history of COPD . The heart size is normal . No pneumothorax or pulmonary edema . Marked interstitial changes compatible with history .
    OUTPUT:
    
1 . New probable left lower lobe pneumonia . 2 . Small right pleural effusion is increased , small left pleural effusion is decreased , and mild bibasilar and retrocardiac atelectasis is stable since ___ . 3 . Hyperinflated lungs , compatible with patient history of COPD .