Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate well - expanded clear lungs . The mediastinal and hilar contours are normal . There has been progressive increase in heart size over the past ___ years . The pleural surfaces are normal without pleural effusion or pneumothorax . Multilevel degenerative changes of the thoracic spine are noted .
    OUTPUT:
    
Mild cardiomegaly is new since last available imaging from ___ years ago . The hilar contours are normal .