1,NeuroradiologyofCVA-SubarachnoidHemorrhage,SAH(蜘蛛網膜下腔出血),2,SubarachnoidHemorrhage(SAH),ClassificationofSAH:1.PrimarySAH(spontaneousSAH)2.SecondarySAH(ICHwithrupturesintotheventricles,subarachnoidspaces)3.TraumaticSAH,1,2,3,3,SAH,Symptoms:headachevomitingneckstiffnessconsciouschange,SpontaneousSAHcausedbyruptureofaneurysm,CT偵測SAH，就是在腦溝、腦池、腦裂甚至於腦室等蜘蛛網膜下腔看到CSF由暗變白，有時合併輕微腦室擴張,4,BilateralA1portionofACAAnteriorcommunicatingartery(ACoA)BilateralPCoABilateralproximalPCA,5,OsbornAG,85%ofaneury
