title: Retroperitoneal emphysema after colonoscopic polypectomy.
mesh_terms: D003106:Colon / Q000601:surgery; D004646:Emphysema / Q000209:etiology*; D006801:Humans; D007417:Intestinal Polyps / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D012187:Retroperitoneal Space; D012812:Sigmoidoscopy / Q000009:adverse effects*