The aim of this study was to demonstrate the usefulness of endovascular treatment for gastroduodenal artery pseudoaneurysm with an arteriovenous fistula after simultaneous pancreas-kidney transplantation. We describe the case of a 38-year-old man who underwent successful simultaneous pancreas-kidney transplantation. An asymptomatic pseudoaneurysm of the donor gastroduodenal artery with an arteriovenous fistula was incidentally diagnosed by routine color flow Doppler ultrasound (CDU) examination and confirmed by 3-D gadolinium-enhanced magnetic resonance angiography (MRA) 15 days after transplantation. Selective arteriography (via the right femoral artery) confirmed an arteriovenous fistula and a pseudoaneurysm of the donor gastroduodenal artery. The patient underwent successful endovascular embolization. At 11 months of follow-up, normal pancreatic function was reported. Endovascular treatment for gastroduodenal artery pseudoaneurysm with an arteriovenous fistula after pancreas transplantation obviates the need for surgical intervention.