Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Low lung volumes are present . Heart size is mildly enlarged but similar compared to the prior exam . Mediastinal contours are unchanged . There is new perihilar haziness with vascular indistinctness compatible with mild interstitial pulmonary edema . Elevation of the right hemidiaphragm is chronic . No definite pleural effusion or pneumothorax is identified . Multilevel degenerative changes are noted in the thoracic spine . There is diffuse atherosclerotic calcification of the aorta .
    OUTPUT:
    
Mild interstitial pulmonary edema .