The location of conus medullaris according to age and sex was retrospectively evaluated With a 0.5-T magnetic resonance (MR) imaging system. A total of 639 subjects without any conspicuous spinal canal pathology on the lumbar MR imaging examination were selected. The level of conus medullaris was most commonly located at the T-12-L-1 intervertebral disc level in the whole population. Our results do not correlate with the previous studies. No significant difference in the corms level was found with increasing age. (C) 2002 Elsevier Science Inc. All rights reserved.