Fig. 1From: How to locate the fistula orifice of spinal extradural arachnoid cyst: Surgical experience and clinical outcomeSchematic diagram of the fenestration position. (A & B: We used the mid-upper 1/4 to 2/4 (1/2) of the cyst length shown by MRI sagittal images and the opposite side of the compressed dural sac of the spinal canal by MRI axial images as the estimated location of the fistula orifice. Boxes indicate the position of fenestration.)Back to article page