[Intradural extramedullary cavernoma of cauda equina].

Cavernous angiomas are comparatively rare vascular malformations in the central nervous system. Their location at the spinal level is rare, being but 3 to 16% of such vascular malformations. Among spinal intradural cavernous malformations most are intramedullar, the extramedullar type being less frequent. We have only came across five cases in the literature of intradural extramedullar cavernous angiomas affecting the cauda equina. We present a new such case with acute onset and later chronic evolution affecting the cauda equina through an intradural cavernous malformation at the level.