Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from ___ . Surgical chain sutures seen along the right thorax laterally . There is elevation of the left hemidiaphragm . Left lung base is partially obscured due to overlying chest wall pacing device . Linear opacity in the left mid lung suggestive of atelectasis versus scarring . Elsewhere , the lungs are clear . Cardiomediastinal silhouette is within normal limits and unchanged . Osseous structures are unremarkable .
    OUTPUT:
    
No definite acute cardiopulmonary process .