Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . The pulmonary vascularity is normal . Linear opacities in the lung bases are compatible with subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Diffuse demineralization in the osseous structures is noted . No acute osseous abnormality is seen .
    OUTPUT:
    
Subsegmental bibasilar atelectasis .