This 7-year-old boy presented with a 7-month history of back pain with radiation into the lower extremities. He had no gait changes or bladder dysfunction. His medical history was notable for premature birth. Three lumbar puncture attempts for sepsis evaluation were made when he was a neonate. Reportedly, a stylet was not used in the procedure and cerebrospinal fluid was difficult to obtain.
Motor, sensory, and reflex examinations revealed normal findings. He had positive straight leg raise tests bilaterally at 30°. Flexion and extension of the lumbar spine was limited due to pain. Magnetic resonance (MR) images of the lumbar