Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette is enlarged . There is no pleural effusion . Multiple healed rib fractures are present . Pacer leads seen in the right atrium and right ventricle .
    OUTPUT:
    
Apparent mediastinal widening corresponds to mediastinal lipomatosis on chest CT . Multiple healed rib fracture .