Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Lung volumes are low , with mild streaky opacities in the lung bases most likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild bibasilar atelectasis .