PURPOSE: To evaluate the therapeutic effect and difficulty of embolization of pseudaneurysm of the splanchnic artery. MATERIALS AND METHODS: Between February 1988 and June 1996, we employed transcatheter embolization to treat a total of eleven patients with splanchnic artery pseudoaneurysm by transcatheter embolization. Eight were males and three were females ; their ages ranged from four to 70 years (mean 44). Three patients had previously been operated on, three had undergone biopsy, and on three, percutaneous transhepatic biliary drainage had been performed ; one had been involved in a traffic accident and one had suffered a gun-shot wound. All patients underwent diagnostic angiography and superselective embolization using a 3F microcatheter. We used Gelfoam with microcoil four times, microcoil twice, Gelfoam once, Gelfoam with ethanol once, a detachable balloon once, and Ivalon once. RESULTS: Arteries in which pseudoaneurysm had occurred were as follows: renal, four, hepatic, three; gastroduodenal, two ; superior mesenteric, one. Nine patients underwent one session of procedure and two underwent two session. Nine patients (82%) were treated successfully and without complication by embolization. Two patients failed to embolize due to vascular spasm and tortuosity in one and a wide aneurysmal neck in the other ; one of these died six days later and the other was operated on. CONCLUSION: Although there are therapeutic difficulties in cases of vascular spasm, tortuosity, or a wide aneurysmal neck, embolization of pseudoaneurysm of the splanchnic artery is a safe and effective life-saving procedure.