Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mildly enlarged compared to the prior chest radiograph , however this may be projectional . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild cardiomegaly , but otherwise normal chest radiograph .