[Arteriovenous Malformations(AVM)].

Recently, a KRAS mutation located in the endothelial cells of the nidus in arteriovenous malformations(AVMs)was reported. The findings indicate the possibility of medical therapy against cerebral AVMs; the blockade of RAS-MAPK signaling cascade may stabilize AVM nidus. As for surgical treatment for AVMs, achievement of low morbidity is the most important objective. To achieve this, assessment of blood flow, usage of non-stick bipolar forceps, and 3D simulation prior to operation are important. Assessment of individual cases for surgical treatment leads to low morbidity in surgeries.