A 12-years-old female subject, without previous history of trauma, complained of mild low-back pain and right sciatic pain. At physical examination the ankle jerk was absent on the right and severe leg pain was elicited by the Lasègue test. No sensory or motor deficits were detectable. Computed tomography and nuclear magnetic resonance examinations showed a right paramedian L5/S1 disc prolapse, exerting a compressive action on the dural sac. Nonoperative, medical treatment was successful and a complete disappearance of symptoms was observed after 6 weeks, without recurrence during a 36-months follow-up.