Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy wires are unchanged as are mediastinal clips . A pacer defibrillator unit projects over the left chest with leads in the right atrium and right ventricle as well as a set of abandoned leads , all similar to prior exam . The heart continues to be enlarged but not changed from prior exam . The mediastinal contours are not widened . The lungs demonstrate prominent pulmonary vasculature and mild edema . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
Stable cardiomegaly with mild edema - may represent early heart failure .