Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . Lung volumes are lower than they were on the previous study . There is some mild left basilar atelectasis , but no focal consolidation concerning for pneumonia . Surgical hardware is seen overlying the lower cervical spine .
    OUTPUT:
    
Mild left basilar atelectasis . No pneumonia .