Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The lateral view is suboptimal as the patient 's arm obscures a large portion of the field of view . Given this , the patient is status post median sternotomy and CABG . The cardiac silhouette remains mild to moderately enlarged . The aortic knob is calcified . Left - sided pacer device is stable in position as are abandoned leads .
    OUTPUT:
    
Enlargement of the cardiac silhouette . Grossly clear lungs .