Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post previous median sternotomy and coronary artery bypass surgery . Mediastinal lipomatosis results in widening of the mediastinum and extends along the left heart border . Allowing for this factor , heart is within normal limits in size . Pulmonary vascularity is normal , and lungs are grossly clear except for minimal scarring adjacent to left pericardial fat pad . No pleural effusion or acute skeletal finding .
    OUTPUT:
    
No radiographic evidence of pneumonia .