Advances in endovascular therapy have allowed interventional radiologists to contribute to the management of visceral arterial aneurysms for not only elective interventions but also for urgent procedures in patients presenting visceral arterial aneurysm rupture. The authors describe and illustrate both imaging diagnosis and endovascular therapy of visceral arterial aneurysm based on their experiences. Transcatheter coil embolization can provide an alternative method of treatment for both ruptured and nonruptured visceral arterial aneurysms excluding dissecting lesion that is treated by stent-graft. The authors performed transcatheter coil embolization in the treatment of 20 nonruptured visceral arterial aneurysms and 8 ruptured lesions. They have included in this book their data and the implications for treating visceral arterial aneurysms.