Cerebrospinal fluid dynamics in the tardive cauda equina syndrome of ankylosing spondylitis

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Abstract
Typical cauda equina syndrome secondary to long‐standing ankylosing spondylitis is reported in a 63‐yerar‐old man. Radionuclide cisternography demonstrated a resorption defect of cerebrospinal fluid in the enlarged lumbosacral dural sac. After transient symptomatic improvement with acetazolamide, a lumboperitoneal shunt was placed. The rate of cerebrospinal fluid, isotope resorption became normal. In the 5 years of follow‐up, partial remission has been observed.