Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . The sternum is not well assessed with this technique . The cardiac , mediastinal and hilar contours appear unchanged , including mild cardiomegaly as well as calcification and tortuosity of the aorta . There is no pleural effusion or pneumothorax . The chest is probably hyperinflated to some degree . A coarse irregular reticular opacification in the left upper lung is a stable chronic - appearing but non-specific finding . Streaky opacities at the left lung base suggest minor scarring . A stable focal nodular opacity projecting over the right upper lobe . As before , a small nipple shadow projects over the right mid chest .
    OUTPUT:
    
No evidence of acute disease .