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Sağlık Bakanlığı Ankara Hastanesi Nöroşirürji Kliniği, Ankara Extradural arachnoidal cysts, congenital or acquired, are notoriously uncommon disorders. Earliest papers on posttraumatic arachnoidal cysts were prepared by Hyndmann and Gerber, in 1946. In this paper, a case of acquired arachnoidal cyst occurring due to an iatrogenic defect in dura mater, which happened during the operation of a lumbar disc herniation, is described. The interesting point is the reappearance of pre-operative symptoms, after a short period of remission. Anahtar Kelimeler : Posttraurnatic extradural arachnoidal cyst