Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Overlying EKG leads are present . There is mild left basal atelectasis abutting the left heart border . Otherwise the lungs are clear . No signs of pneumonia , edema , effusion or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact .
    OUTPUT:
    
Mild left basal atelectasis , otherwise unremarkable .