title: C1 dome-like laminotomy and posterior C1-C2 polyaxial screw-rod fixation for a patient with cervical myelopathy due to a retro-odontoid pseudotumor.
abstract: A 49-year-old man presented with progressive cervical myelopathy caused by a retro-odontoid mass, with associated developmental canal stenosis at C1, and C1-C2 instability. Surgery was scheduled for a dome-like laminotomy at C1, posterior C1-C2 fixation using C1 lateral mass screws and C2 pedicle screws, and structural bone grafting between C1 and C2. Prior to surgery, we produced a 3-dimensional full-scale model of the patient's cervical spine and performed a simulation of the scheduled surgery. Through the simulation, we accurately evaluated the laminotomy sites and the screw insertion points. During the actual surgery, all procedures were successful. After surgery, the patient's neurological deficits markedly improved. Successful C1-C2 fusion, adequate decompression of the spinal cord, and spontaneous regression of the retro-odontoid mass were achieved by this procedure without any apparent restriction in neck movement.
authors.affiliation: Spine Section, Department of Orthopaedic Surgery, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chiba 260-8677, Japan. masashiy@faculty.chiba-u.jp
authors.forename: Masashi
authors.initials: M
authors.lastname: Yamazaki
authors.forename: Akihiko
authors.initials: A
authors.lastname: Okawa
authors.forename: Chikato
authors.initials: C
authors.lastname: Mannoji
authors.forename: Ryo
authors.initials: R
authors.lastname: Kadota
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Miyashita
authors.forename: Masao
authors.initials: M
authors.lastname: Koda
mesh_terms: D001863:Bone Screws; D006104:Granuloma, Plasma Cell / Q000150:complications; D006801:Humans; D021621:Imaging, Three-Dimensional; D016268:Internal Fixators; D007796:Laminectomy / Q000379:methods*; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D009809:Odontoid Process / Q000473:pathology / Q000503:physiopathology*; D013118:Spinal Cord Diseases / Q000209:etiology / Q000601:surgery*