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Letters to the Editor

We are very grateful to Mr H B Griffith for his permission to report his case and his valuable comments on the manuscript. We are also grateful to Dr Bradshaw for conducting the radiological investigations. AB JAMJOOM JBL TAN Department of Neurosurgery, Frenchay Hospital, Frenchay, Bristol BS16 ILE,

United Kingdom

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C:orrespondence to: Mr AB Jamjoom.

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1 Ford LT. Symposium: complications of lumbar disc surgery. Local complications. I Bone Joint Surg (Am) 1968;50-A:419-28. 2 Hyndrnan OR, Gerber WF. Spinal extradural cysts congenital and acquired. J Neurosurg 1946;3:474-86. 3 Swanson HS, Fincher EF. Extradural arachnoidal cyst of traumatic origin. J Neurosurg

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