AVM imaging in Gamma knife (G.K)

Introduction & Background: We reported more than 50 cases of AVM imaging before & 2 years after G.K. Surgery and embolization therapy were used for many years in the treatment of arteriovenous mal-formations (AVM). Here we discuss how Gamma Knief is used in the treatment of AVM. The nidus of the AVM was first defined with DSA and multiple sequences of MRI. Planning was then performed by the Gamma Knife team as the 3D MR angiography (MRA) and CT angiography (CTA) are not suitable for planning. Important factors for the selection of cases are size, volume, and location. We will also dis-cuss the role of radiologists in target definition and relation of vital organs around the AVM that might also receive radiation. We will also discuss other vas-cular lesions such as cavernous hemangioma that are currently treated using Gamma Knife. Multiple cases of AVM with follow up imaging treated with Gamma Knife in Iran are demonstrated. Complications of G.K, radiation necrosis, and several case studies are also presented.