A 77-year-old woman underwent colonoscopic balloon dilatation for colonic stricture 1 year after laparoscopic anterior resection of sigmoid colon cancer. During the balloon dilatation, panfacial swelling and apnea were noted. Emergency endotracheal intubation was undertaken. Chest X-ray revealed diffuse subcutaneous emphysema and bilateral pneumothorax. We discuss the possible mechanism and management of this uncommon complication during therapeutic colonoscopy.
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