Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is hyperinflation of the lungs with flattening of the hemidiaphragms , compatible with COPD . The heart is normal in size . The mediastinal and hilar contours are normal . The aorta is tortuous , similar to the prior study . There is no airspace opacity concerning for pneumonia . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild basilar atelectasis but no evidence of pneumonia .