Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated , consistent with known severe emphysema . There is mild pulmonary edema . There is an increased patchy opacity in the left lung base compared with prior exams , which is concerning for infection . There is a small left - sided pleural effusion , similar to prior exam . The previously seen right pleural effusion has resolved . There is no pneumothorax . There is cardiomegaly , unchanged from prior exam . Surgical clips are seen in the upper mid abdomen .
    OUTPUT:
    
1 . Patchy opacity in the left lung base , concerning for infection in the correct clinical setting . 2 . Mild pulmonary edema . 3 . Small left pleural effusion , similar to the prior exam . 4 . Severe emphysema .