A case is presented of an intraspinal extradural ganglion cyst at the L4-5 level. The clinical picture suggested a herniated nucleus pulposus at this level. A myelogram revealed a round lesion almost completely obstructing the flow of Pantopaque at the L4-5 level. A ganglion cyst with a haemorrhage into it and the surrounding tissue was removed, and surgery was followed by complete recovery.
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Brish et al. (1972) studied this question.
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