Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Normal heart size , mediastinal and hilar contours . Unchanged thoracic aortic tortuosity . No focal consolidation , pneumothorax or pleural effusion . There is a a 8 mm nodular opacity projecting over the sixth rib posteriorly on the right .
    OUTPUT:
    
1 . No acute process 2 . 8 mm nodular opacity projecting over the 6 rib posteriorly on the right which is not clearly seen on the prior study and may rib reflect superimposed vessels or a bone island