Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . A vascular stent in the left subclavian region is noted . Lung volumes are low limiting assessment . Allowing for this the lungs are clear aside from mild left basal atelectasis . No convincing evidence for pneumonia or edema . No large effusion or pneumothorax . Cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
Mild left basal atelectasis . No convincing evidence for pneumonia .