Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The mediastinal and hilar contours are unremarkable . There is minimal calcification at the aortic knob . The pulmonary vascularity is normal . No pleural effusion , focal consolidation or pneumothorax is visualized . There are mild degenerative changes in the mid thoracic spine .
    OUTPUT:
    
Mild cardiomegaly . No acute cardiopulmonary abnormality .