Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are obtained . Midline sternotomy wires are noted . The heart is mildly enlarged . The lungs appear clear bilaterally . No pleural effusion or pneumothorax is seen . Mediastinal contour is unremarkable . Bony structures are intact . There is no free air below the right hemidiaphragm .
    OUTPUT:
    
Mild cardiomegaly . No signs of CHF or pneumonia .