A tethered cord is often diagnosed as a " low conus . " The conus medullaris ( or lower termination of the spinal cord ) normally terminates at or above the L1-2 disk space ( where L1 is the first, or topmost lumbar vertebra ).
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Spinal abnormalities, e . g . intramedullary dermoid cysts may arise more frequently in the lumbosacral region ( quite often at the level of the conus medullaris ) and may be seen with other congenital anomalies of the spine including posterior spina bifida occulta as identified by the neuroradiological analysis.
