In this report the Authors present the case of an old patient treated for chronic recurrent bleeding from small bowel angiodysplasia. The diagnosis was missed by the conventional methods: angiography and scintiscan with marked erythocytes. Diagnosis was instead possible by using intraoperative enteroscopy. The Authors stress the usefulness of this technique that permits the exploration of the mucosal by transillumination to discover bleeding and vascular anomalies of the bowel.