Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two subcentimeter nodules , really dense , are seen in right upper lobe and could possibly be calcified . Lung volumes are low with bibasilar mild atelectasis . The patient has prior history of sternotomy for CABG , and the mediastinal and cardiac contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Two subcentimeter right upper lobe lung nodules are really dense , probably calcified . Comparison with a prior chest x-ray from outside hospital would be useful to assess their stability .