The perpendicular nerve root sign.
Rosenblum
B R
BR
Mount Sinai Hospital, New York, New York.
D006801:Humans; D007405:Intervertebral Disc Displacement / Q000473:pathology* / Q000601:surgery; D008159:Lumbar Vertebrae / Q000601:surgery; D013126:Spinal Nerve Roots / Q000473:pathology*