Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate normal cardiac size . The thoracic aorta is minimally tortuous with arch calcifications . There are stable right hilar post - surgical changes of upper lobectomy and elevation of the right hemidiaphragm . There are areas of subsegmental atelectasis in the left and right mid lung . No confluent consolidation to suggest pneumonia . No pleural effusions . Patient is status post bilateral shoulder arthroplasties .
    OUTPUT:
    
Low lung volumes and multifocal subsegmental atelectasis , without definite evidence of pneumonia . Stable post - surgical changes in the right lung .