Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright portable chest radiograph demonstrates no intraperitoneal free air . The lungs are clear , with minimal left basilar linear atelectasis . There is no pleural effusion or pneumothorax . The cardiac silhouette and mediastinal contours are normal . The pulmonary vasculature is normal .
    OUTPUT:
    
Minimal left basilar atelectasis with no acute chest abnormality .