Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is marked hyperlucency of the upper lung zones , compatible with severe emphysema . The hilar and mediastinal contours are within normal limits . Since ___ right basal atelectasis has cleared and mild vascular congestion resolved . There is no pneumothorax , or pleural effusion .
    OUTPUT:
    
Severe COPD . No evidence of pneumonia , heart failure or other acute abnormality .