title: Endoscopic removal of herniated nucleus pulposus migrated dorsally to the dural sac.
abstract: A herniated nucleus pulposus (HNP) migrated dorsally to the dural sac is a rare condition. Here, we present a case, in which the HNP was removed with minimally invasive spinal endoscopy. A 54-year-old man presented complaining of left leg pain and paresis. Neurologic findings and an MRI suggested an epidural tumor or a dorsally migrated HNP compressing the S1 nerve root and dural sac. With a spinal endoscope, careful laminotomy of caudal L5 and cranial S1 was made. En bloc flavectomy exposed a mass covered with a thin capsule. The mass was identified as a dorsally migrated HNP. After complete HNP fragment removal, the dural sac and S1 nerve root were decompressed. Immediately postoperative, the leg pain subsided and motor function normalized, although the patient complained of numbness at the S1 dermatome area. In summary, a large HNP that had migrated dorsally to the dural sac was successfully removed endoscopically.
authors: Department of Orthopedic Surgery, Teikyo University Mizonokuchi Hospital, Kawasaki, Japan.
authors: S
authors: S
authors: Koga
authors: K
authors: K
authors: Sairyo
authors: T
authors: T
authors: Kon
authors: I
authors: I
authors: Shibuya
authors: Y
authors: Y
authors: Kanamori
authors: T
authors: T
authors: Kosugi
authors: R
authors: R
authors: Konno
authors: T
authors: T
authors: Arai
authors: A
authors: A
authors: Dezawa
mesh_terms: D004388:Dura Mater / Q000601:surgery*; D004724:Endoscopy; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000601:surgery*; D008159:Lumbar Vertebrae; D008297:Male; D008875:Middle Aged