Fig. 2From: How to locate the fistula orifice of spinal extradural arachnoid cyst: Surgical experience and clinical outcome A: The fistula location of the cyst was found after interlaminar fenestration, which was lined with gelatin sponge to avoid damage to the spinal nerve during suturing. (Arrow: the location of fistula orifice.) B: the suturing of the fistulaBack to article page