Intradural lumbar disc protrusion. A case report.

We report a rare case of intradural lumbar disc protrusion describing a specific myelographic appearance that may help in preoperative diagnosis. Most of these patients present with acute sciatica and neurologic deficit. Preoperative awareness and diagnosis is of importance because the extruded disc protrusion lies intrathecally and must be specifically looked for and removed from its intradural position.