title: Primary amyloidoma in epidural and paravertebral space of the lumbar spine.
abstract: BACKGROUND
  Localized amyloid deposits result in a mass, that is, so-called amyloidoma; it has been reported in every anatomic site, although systemic amyloid deposition is much more common. However, primary lumbar epidural amyloidoma without bony involvement is extremely rare. To the best of our knowledge, only one case has been reported previously.
  
  
  OBJECTIVE
  To report and review the clinical presentations, imaging studies, and treatment of epidural and paravertebral amyloidoma.
  
  
  METHODS
  A case report and review of the literature.
  
  
  METHODS
  Lumbar epidural and paravertebral amyloidoma in a 75-year-old man with neurologic compromise is presented. Laminectomy with mass resection was performed.
  
  
  RESULTS
  After surgery, almost complete neurologic improvement was observed. Histologically, definite diagnosis was obtained only after the specific staining of tissue. No sign of local recurrence was evident 1 year after surgery.
  
  
  CONCLUSIONS
  Primary amyloidoma, although rare, should be included in the differential diagnosis of epidural mass of the spine. Diagnosis before surgery is difficult as there were no characteristic findings in clinical and imaging studies. Special histologic technique and stains are useful to make a definite diagnosis.
authors.affiliation: Department of Orthopedic Surgery, Osaka National Hospital, 2-1-14 Hoenzaka Chuo-ku Osaka, Osaka 5400006, Japan. Electronic address: h-aono@umin.ac.jp.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Aono
authors.forename: Shigeki
authors.initials: S
authors.lastname: Kakunaga
authors.forename: Shuji
authors.initials: S
authors.lastname: Koide
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Tobimatsu
authors.forename: Masayuki
authors.initials: M
authors.lastname: Kuroda
authors.forename: Ikuo
authors.initials: I
authors.lastname: Kudawara
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Mori
authors.forename: Eiichi
authors.initials: E
authors.lastname: Konishi
authors.forename: Takafumi
authors.initials: T
authors.lastname: Ueda
mesh_terms: D000368:Aged; D000686:Amyloidosis / Q000473:pathology* / Q000601:surgery; D019299:Decompression, Surgical; D004824:Epidural Space / Q000473:pathology* / Q000601:surgery; D006801:Humans; D008159:Lumbar Vertebrae / Q000473:pathology* / Q000601:surgery; D008297:Male
keywords: Amyloidoma; Epidural; Lumbar spine; Paravertebral; Primary