Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior exam , there is little change . A pigtail chest tube is in unchanged position . There is no residual pneumothorax . The right basilar atelectasis has improved . The there is no evidence of pneumonia , pulmonary edema , pleural effusion , or a left pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
No residual pneumothorax is identified .