title: Primary amyloidoma of the thoracic spine presenting with acute paraplegia.
abstract: BACKGROUND
  Primary solitary amyloidoma of the spine is a rare disease characterized by localized deposition of amyloid. To the best of our knowledge, there have been only 14 cases previously reported in the literature. Patients with focal spinal amyloidoma usually have relatively long symptomatic periods preoperatively, ranging from 3 weeks to 6 years (mean: 12 months). Only two reported patients had acute paraplegia. We add a third case of a thoracic spine amyloidoma presenting with acute paraplegia.
  
  
  METHODS
  A 65-year-old man presented with a three-day history of progressive paraplegia and urinary retention. He was found to have severe cord compression at T2 on magnetic resonance imaging. He underwent emergent decompressive laminectomy with instrumentation for spinal stabilization. Histopathology revealed abundant amyloid deposits. A systemic work-up was negative for amyloidosis. The patient showed marked neurological improvement with residual mild spastic gait after 1 year.
  
  
  CONCLUSIONS
  Primary spinal amyloidoma with acute paraplegia is rare. One-stage surgery combining prompt decompression and stabilization of the spinal column is mandatory in cases of spinal amyloidoma with acute myelopathy, because primary solitary amyloidoma carries a good prognosis.
authors.affiliation: Department of Neurological Surgery, Aichi Medical University, Aichigun, Aichi, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Mizuno
authors.forename: H
authors.initials: H
authors.lastname: Nakagawa
authors.forename: Y
authors.initials: Y
authors.lastname: Tsuji
authors.forename: T
authors.initials: T
authors.lastname: Yamada
mesh_terms: D000208:Acute Disease; D000368:Aged; D000686:Amyloidosis / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D003937:Diagnosis, Differential; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010264:Paraplegia / Q000209:etiology*; D013122:Spinal Diseases / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D013904:Thoracic Vertebrae / Q000473:pathology* / Q000601:surgery*