Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . No prior chest x-ray for comparison . There is elevation of the left hemidiaphragm as seen on same day abdominal CT . Linear opacity at the left lung base is likely due to atelectasis versus scarring . There is no pleural effusion . There is moderate cardiomegaly . Hilar contours are enlarged , likely due to pulmonary arterial enlargement . Median sternotomy wires and mediastinal clips are identified . Atherosclerotic calcifications seen at the aortic arch . No acute osseous abnormality is identified .
    OUTPUT:
    
Moderate cardiomegaly . Enlarged hilar contours which are thought to be due to pulmonary artery enlargement , but this can be confirmed by CT .