Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged with an enlarged pulmonary artery contour which could be seen with pulmonary arterial hypertension of shunting . The lungs appear clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
Cardiomegaly and central pulmonary arterial enlargement , which could be seen with pulmonary artery hypertension or left to right shunting ; however , no evidence of acute disease .