Retroperitoneal, mediastinal and subcutaneous emphysema as a complication of routine upper gastrointestinal endoscopy.

Diagnostic endoscopy of the upper gastrointestinal tract is a safe procedure, which, however, is not without complications. We report the rare occurrence of retroperitoneal, mediastinal and subcutaneous emphysema following routine endoscopy, with no obvious evidence of a site of perforation. Possible etiological aspects are discussed. This complication appeared to be a benign clinical condition that was resolved with conservative, nonsurgical treatment.