Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is within normal limits . The mediastinal and hilar contours are unremarkable . The lungs are hyperinflated and lucent with flattened hemidiaphragms , compatible with severe COPD . However , no lobar consolidation is present and minimal bibasilar atelectasis is noted . Pulmonary nodules seen on prior CT are better evaluated on CT . No large pleural effusion or pneumothorax is present .
    OUTPUT:
    
Severe COPD but no evidence of pneumonia .