A patient with mobile neurioma of the cauda equina is described in this report.
This 31-year-old man was hospitalized because of low back and gluteal pain. Neurological examination failed to reveal any abnormalities. MRI scan after injection of Gd-DTPA showed an area of high signal intensity at the L2 level. Myelogram demonstrated an almost complete block with characteristics of a well circumscribed intradural extramedullary tumor. It also showed that the level of the tumor varied between L2 and L4 according to the patient's position.
After induction of anesthesia and placing the patient in the prone position, myelography was repeated. This was useful for identifying the tumor location. A recapping laminoplasty of L2 was performed, the dura a was opened, and the tumor was exposed. The tumor was mobile but originated from a single elongated nerve of the cauda equina. Pathological examination revealed neurinoma.