Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . The lungs are clear without consolidation , effusion or pulmonary vascular congestion . Cardiomediastinal silhouette is enlarged . Single lead pacing device again noted . No acute osseous abnormality detected .
    OUTPUT:
    
Enlarged cardiac silhouette without superimposed acute cardiopulmonary process .