Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Midline sternotomy wires again noted as well as a left chest wall pacer device with leads extending into the region of the right atrium and right ventricle . A prosthetic cardiac valve is also noted . The heart remains mildly enlarged . The mediastinal contour is stable . There is no focal consolidation , large effusion or pneumothorax . No overt signs of edema . Bony structures appear intact .
    OUTPUT:
    
Stable cardiomegaly . No overt signs of edema or pneumonia .