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 within the right lung base likely reflect subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is definitively noted . There are no acute osseous abnormalities .
    OUTPUT:
    
Subsegmental right basilar atelectasis .