Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are unremarkable , with the heart size within normal limits . The pulmonary vasculature is normal . Apart from minimal atelectasis in the lung bases , the remainder of the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . No acute osseous abnormalities identified .
    OUTPUT:
    
Mild bibasilar atelectasis . No radiographic evidence for pneumonia .