Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours appear within normal limits . A small hyperdense nodule projecting over the right upper lobe appears unchanged , probably calcified . Otherwise , the lungs appear clear . There are no pleural effusions or pneumothorax . Minimal degenerative changes are noted along the mid thoracic spine .
    OUTPUT:
    
Mild cardiomegaly . No evidence of acute disease .