Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy , aortic valve replacement , and CABG . Heart size is normal . Mediastinal contours are unchanged with tortuosity of the thoracic aorta again noted . Calcification of the aortic arch is again seen . There is no pulmonary vascular congestion . Hilar contours are normal . Lungs are clear without focal consolidation . Previously noted bilateral pleural effusions have nearly completely resolved with only a trace left pleural effusion identified . No pneumothorax is seen . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Trace residual left pleural effusion . Otherwise , no acute cardiopulmonary process .