Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is slightly unfolded . The pulmonary vasculature is normal . Hilar contours are normal . Subsegmental atelectasis is noted in the right lung base . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities detected .
    OUTPUT:
    
Subsegmental right basilar atelectasis .