Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear left basilar atelectasis is noted . Nodular densities over lung bases are most compatible with nipple shadows . Lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . Old healed left posterior rib fractures are noted . Partially visualized catheter projects over the upper abdomen .
    OUTPUT:
    
No acute cardiopulmonary process .