Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright portable radiograph of the chest demonstrates single - lead pacemaker in appropriate position . The patient is status post CABG . The heart is markedly enlarged and there is evidence of thickening of the minor fissure on the right as well as relatively increased density of the right and left lower lobes , with no evidence of overt pulmonary edema or interstitial fluid . No pneumothorax is present , and there is no evidence of pneumonia .
    OUTPUT:
    
Markedly enlarged cardiac silhouette with findings suggestive of chronic fluid overload with no evidence of acute pulmonary edema .