Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Artifacts from multiple external lines and supporting devices are present . Linear , tubular appearing opacity crossing the left lower lobe is likely external as well or might represent subsegmental atelectasis .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .