Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate unchanged ___ rod posterior to the spine and left PICC in place . The cardiomediastinal silhouette is within normal limits . The lungs are clear . There is no pneumothorax , vascular congestion , or pleural effusion . Trace atelectasis may be present in the left base .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .