fig 2.

Case 19: Increase of blood supply from residual small feeders. Embolization was performed with PVA particles and platinum coils.

A, Before treatment, the right occipital AVM is supplied mainly by the parietooccipital artery on left vertebral angiogram.

B, The parietooccipital artery is occluded during embolization, and a small part of the AVM is fed by the calcarine and the posterior temporal (single arrowhead) arteries and by the meningeal branch of the vertebral artery (arrow) on angiogram obtained immediately after embolization. Double arrowheads indicate platinum coils in the parietooccipital artery.

C, Blood supply of the posterior temporal artery (single arrowhead) and meningeal branch of the vertebral artery (arrow) increases, and the residual AVM enlarges 3 months after embolization. Double arrowheads indicate platinum coils in the parietooccipital artery.