Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The main pulmonary artery is enlarged , as seen on preceeding chest CT . The aorta is calcified and tortuous . The cardiac silhouette is enlarged . No focal consolidation is seen . There is no large pleural effusion or pneumothorax . No overt pulmonary edema . No displaced fracture is seen .
    OUTPUT:
    
Enlarged pulmonary artery suggesting pulmonary arterial hypertension . Cardiomegaly .