Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again is seen a left - sided pacer unit with leads in the right atrium and right ventricle . Sternotomy wires and mediastinal clips associated with post - CABG changes are stable . The heart size is stably enlarged . The mediastinal contours demonstrate calcified atherosclerotic disease of the aortic knob with a mildly tortuous aorta . The lungs are clear of consolidation and while the pulmonary vasculature is prominent , there is no septal thickening to suggest pulmonary edema . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Cardiomegaly and post-CABG changes , but no evidence of pneumonia or pulmonary edema .