Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Elevation of the right hemidiaphragm is unchanged . The cardiac , mediastinal and hilar contours are similar . Heart size is normal . There is crowding of the bronchovascular structures , but no overt pulmonary edema is demonstrated . Linear opacities in the right lung base are compatible subsegmental atelectasis . No new focal consolidation , pleural effusion or pneumothorax is present . Degenerative changes of both acromioclavicular joints are noted .
    OUTPUT:
    
Right basilar subsegmental atelectasis .