Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mild to moderately enlarged . The main pulmonary artery contour is also somewhat prominent which may suggest pulmonary arterial enlargement . Central pulmonary arteries are mildly prominent . The aortic arch is calcified . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes are noted along the mid thoracic spine .
    OUTPUT:
    
Mild - to - moderate cardiomegaly . Enlarged main pulmonary artery contour and prominence of central pulmonary arteries , which may reflect potentially pulmonary arterial hypertension . No evidence for congestive heart failure , however .