Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . The heart size is normal . The mediastinal contours are unremarkable . The right PICC has been removed . As before , there is continued upward retraction of the hila with bilateral upper lobe scarring , similar when compared to the prior study . Findings may reflect prior sarcoidosis or tuberculosis . Patchy opacity in the right lung base may reflect atelectasis . Infection can not be excluded . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities . Projecting over previous left upper quadrant of the abdomen is a surgical clip .
    OUTPUT:
    
Bilateral upper lobe scarring with upward retraction of hila suggestive of sarcoidosis or prior tuberculosis which is similar compared to prior studies . Patchy opacity in the right lung base may reflect atelectasis but infection can not be excluded .