Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Clips along the left mediastinal border again noted . There is again noted to be mild elevation of left hemidiaphragm with mild left basal opacity likely atelectasis . No convincing evidence for pneumonia edema effusion or pneumothorax . Cardiomediastinal silhouette is stable . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
No acute findings . Left basal atelectasis appears chronic .