Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is moderately enlarged . The aorta is mildly tortuous . The mediastinal and hilar contours are otherwise unremarkable . The lung volumes are low . Within the limitations of technique , the lungs appear clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Moderate cardiomegaly . Clear lungs .