title: A case of calcification of the cervical ligamentum flavum.
abstract: We report a case of cervical myelopathy caused by the calcification of the cervical ligamentum flavum. A 42-year-old woman with gait disturbance and an episode of dysuria was transferred to our hospital on June 30, 1994. Neurological examination revealed only a mild right hemiparesis. A plain neck X-ray and a tomogram revealed a nodular calcification in the posterior part of the spinal canal at the level of C5/6. Three dimensional computed tomography clearly demonstrated that the mass consisted of three nodular structures on the vertebral lamina. Magnetic resonance images demonstrated severe compression of the spinal cord by the mass whose intensity was low. The mass was removed en bloc together with the ligamentum flavum and C5 and C6 lamina. The mass showed no continuity to the dura mater. The calcification was confined within the ligament. The patient's neurological deficits were resolved two weeks after the surgery. X-ray diffraction study demonstrated the component of the mass was found to be pure hydroxyapatite. Clinical features of calcification of the ligamentum flavum are reviewed from 85 reported cases including ours, and the difference between this calcification and the ossification of the ligament is emphasized. Calcification of the ligamentum flaum is a distinct clinical entity.
authors.affiliation: Department of Neurosurgery, Sapporo Medical University School of Medicine.
authors.forename: K
authors.initials: K
authors.lastname: Haraguchi
authors.forename: T
authors.initials: T
authors.lastname: Yamaki
authors.forename: Y
authors.initials: Y
authors.lastname: Kurokawa
authors.forename: M
authors.initials: M
authors.lastname: Ohtaki
authors.forename: Y
authors.initials: Y
authors.lastname: Ibayashi
authors.forename: T
authors.initials: T
authors.lastname: Uede
authors.forename: S
authors.initials: S
authors.lastname: Tanabe
authors.forename: K
authors.initials: K
authors.lastname: Hashi
mesh_terms: D000328:Adult; D002114:Calcinosis / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D002574:Cervical Vertebrae / Q000473:pathology; D005260:Female; D006801:Humans; D017843:Ligamentum Flavum / Q000473:pathology; D008279:Magnetic Resonance Imaging; D013117:Spinal Cord Compression / Q000209:etiology; D014057:Tomography, X-Ray Computed