title: Radicular interdural lumbar disc herniation.
abstract: Intraradicular lumbar disc herniation is a rare complication of disc disease that is generally diagnosed only during surgery. The mechanism for herniated disc penetration into the intradural space is not known with certainty, but adhesion between the radicular dura and the posterior longitudinal ligament was suggested as the most important condition. The authors report the first case of an intraradicular lumbar disc herniation without subdural penetration; the disc hernia was lodged between the two radicular dura layers. The patient, a 34-year-old soldier, was admitted with a 12-month history of low back pain and episodic left sciatica. Neurologic examination showed a positive straight leg raising test on the left side without sensory, motor or sphincter disturbances. Spinal CT scan and MRI exploration revealed a left posterolateral osteophyte formation at the L5-S1 level with an irregular large disc herniation, which migrated superiorly. An intradural extension was suspected. A left L5 hemilaminectomy and S1 foraminotomy were performed. The exploration revealed a large fragment of disc material located between the inner and outer layers of the left S1 radicular dura. The mass was extirpated without cerebrospinal fluid outflow. The postoperative course was uneventful. Radicular interdural lumbar disc herniation should be suspected when a swollen, hard and immobile nerve root is present intraoperatively.
authors.affiliation: Department of Neurosurgery, Mohammed V Military Teaching Hospital, University of King Mohammed V-Souissi, Rabat, Morocco. akhaddar@hotmail.fr
authors.forename: Ali
authors.initials: A
authors.lastname: Akhaddar
authors.forename: Omar
authors.initials: O
authors.lastname: Boulahroud
authors.forename: Abad
authors.initials: A
authors.lastname: Elasri
authors.forename: Brahim
authors.initials: B
authors.lastname: Elmostarchid
authors.forename: Mohammed
authors.initials: M
authors.lastname: Boucetta
mesh_terms: D000328:Adult; D004388:Dura Mater / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D007403:Intervertebral Disc / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D007405:Intervertebral Disc Displacement / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D017116:Low Back Pain / Q000209:etiology; D008159:Lumbar Vertebrae / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D008297:Male; D011843:Radiculopathy / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D011859:Radiography; D013115:Spinal Canal / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D016896:Treatment Outcome