A propos 24 cases of gastro-intestinal tract's embolization of which eleven were performed in emergency for bleeding, the principle indications are described and illustrated. In some cases embolization gracefully replaces the ligation by a rapid and simple procedure at the time of diagnostic arteriography, preparing with safety the operative cure. In other cases embolization alone is curative: arteriovenous fistulas, telangiectases in 'Osler-'s disease, radiotherapic bleeding lesions, inoperable cancers. This implies the presence of trained radiologic teams and a tight collaboration with intensive care, endoscopy and surgery in large medical center. In this view the existence of radio-surgical rooms is useful.