Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An epidural catheter overlies the patient . A left thoracostomy tube is oriented superiorly , unchanged in position since the 6 : 59 a .m . study . There is no pneumothorax . A small left pleural effusion is unchanged . Chronic right rib deformities are again seen .
    OUTPUT:
    
No pneumothorax detected .