CAUDA-EQUINA HISTIOCYTOSIS-X

A young child was admitted with a cauda equina syndrome believed to be progressive, but unrelated to a congenital anomaly, Magnetic resonanc e imaging studies revealed the presence of an intradural tumor in the cauda equina, A yellow pasty tumor with nerve root infiltration was id entified at surgery. Histologic features were pathognomonic for histio cytosis X. The patient's management and review of the literature are d iscussed.