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 . The mediastinal contour is unchanged . The lungs are clear of focal consolidation , effusion or pneumothorax . No edema or congestion . Bony structures are intact .
    OUTPUT:
    
Stable mild cardiomegaly without superimposed pneumonia or edema .