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[Iatrogenic intraspinal epidermoid cyst (author's transl)].

A case of an intraspinal cyst following a lumbar puncture is described. A 57 year-old man had a myelography at the level of L-2 revealing a disc herniation of L-4. About two years later he had another myelography for recurrent back pain, which disclosed an intradural extramedullary tumor at the level of L-2. Pathological diagnosis of the tumor was epidermoid cyst. From the topographical standpoint of the tumor, the previous lumbar puncture was thought to be the most likely cause of the epidermoid cyst. This is the third case report, to the best of our knowledge, which had a normal myelogram prior to the development of epidermoid cyst in the spinal canal.