Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires again noted . The heart remains mildly enlarged . Mediastinal contour is unchanged . Lungs are clear without focal consolidation , large effusion or pneumothorax . No signs of congestion or edema . Aortic calcification again noted . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute findings . Stable mild cardiomegaly .