Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left pectoral single - lead cardiac device is unchanged . Severe cardiomegaly is re - demonstrated . The aortic knob is calcified . Mediastinal and hilar contours are similar . Mild pulmonary edema is present . No focal consolidation , pleural effusion or pneumothorax is seen . No acute osseous abnormality is visualized .
    OUTPUT:
    
Mild pulmonary edema .