Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Heart size is difficult to assess due to the presence of a moderate sized right pleural effusion which has slightly increased in size compared to the prior study . There is mild pulmonary edema . Aortic knob is calcified . No pneumothorax is detected . Old left - sided rib fractures are again noted . A compression fracture of an upper thoracic vertebral body is unchanged .
    OUTPUT:
    
Mild congestive heart failure with slight interval increase in size of moderate right pleural effusion .