Fig. 1From: Classification, mechanism and surgical treatments for spinal canal cystsA giant extradural and intradural arachnoid cyst occupied more than six segments intracanal (Left image, shown by right square bracket). Two axial magnetic resonance images (MRI) scan showed the arachnoid cyst located at intradural (Right upper image, showed by arrow) and extradural (Right bottom image, showed by arrow)Back to article page