Intradural herniated cervical disk: a case report and review of the literature.

The herniation of intervertebral disk material into the dural sac is a rare occurrence; a total of 50 cases have been reported in the literature. Forty-five (90%) are reported in the lumbar spine, most at the L4-L5 interspace, three (6%) in the cervical spine [1 , 2, 3], and two (4%) in the thoracic spine [4]. The lesion is reported to have a typical , irregular intradural defect on myelography [5]. We report a case, however, in which conventional myelography was not sufficiently specific, and metrizamide-enhanced CT was essential in the diagnosis.