Background: While the source of most cases of lower gastrointestinal bleeding may be diagnosed with modern radiological and endoscopic techniques, approximately 5% of patients remain who have negative endoscopic and radiological investigations [1].
Clinical problem: These patients require repeated hospital admissions and blood transfusions, and may proceed to exploratory laparotomy and intraoperative endoscopy. The personal and financial costs are significant.
Method of diagnosis and decision making: The technique of adding pharmacologic agents (anticoagulants, vasodilators, fibrinolytics) during standard angiographic protocols to induce a prohemorrhagic state is termed provocative angiography. It is best employed when significant bleeding would otherwise necessitate emergency surgery.
Treatment: This practice frequently identifies a bleeding source (reported success rates range from 29 to 80%), which may then be treated at the same session. We report the case of a patient with chronic lower gastrointestinal hemorrhage with consistently negative endoscopic and radiological workup, who had an occult source of bleeding identified only after a provocative angiographic protocol was instituted, and who underwent succeeding therapeutic coil embolization of the bleeding vessel.