Abstract
Nonsaccular vertebral artery aneurysms involving the posterior inferior cerebellar
artery (PICA) are rare. Treatment is considered a significant challenge because of
their angiographic and anatomical features, especially in high-riding PICA. Therefore,
meticulous preoperative angiographic and anatomical evaluation is necessary. Moreover,
consideration of the distance between the cerebellar skull base and caudal loop of
the PICA is important. We present two cases of occipital artery-high-riding PICA bypass
and discuss important preoperative technical considerations.
Keywords
bypass - occipital artery - posterior inferior cerebellar artery - nonsaccular aneurysm
