Abstract

“Tight filum syndrome” is a name grouping three different conditions associated with symptoms suggesting a tethered spinal cord syndrome: - a low-lying conus caused by a short filum terminale - a normally positioned conus with a thickened and fatty filum terminale - a normally positioned conus with a normal appearing filum terminale: the OFTS, occult filum terminale syndrome. It is easily understood that there exists a consensus among pediatric neurosurgeons about the first and second condition where the definition is anatomical and readily visible on MRI. Criteria for timing of surgery may vary somewhat and the exact pathophysiological mechanisms are not yet completely elucidated, but everyone agrees that the neurological and urological symptoms are caused by the anatomical anomalies.

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