Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . The heart is mildly enlarged . The aortic arch is calcified . The mediastinal and hilar contours appear unchanged . Opacities in the right upper lobe have improved substantially and are mostly resolved . Patchy right infrahilar and left basilar opacities appear more chronic and are similar to earlier radiographs from ___ . A calcified granuloma in the left lower lobe is likewise unchanged . There is no definite pleural effusion or pneumothorax . Minimal anterior wedging of a lower thoracic vertebral body and mild degenerative changes are similar .
    OUTPUT:
    
Marked improvement and nearly resolved right upper lobe pneumonia . Otherwise , stable background findings .