title: Quantification of vertebral involvement in metastatic spinal disease.
abstract: BACKGROUND
  For patients with a solitary and well-delimitated spinal metastasis that resides inside the vertebral body, without vertebral canal invasion, and who are in good general health with a long life expectancy, en bloc spondylectomy/total vertebrectomy combined with the use of primary stabilizing instrumentation has been advocated. However, clinical experience suggests that these qualifying conditions occur very rarely.
  
  
  OBJECTIVE
  The purpose of this paper is to quantify the distribution of vertebral involvement in spinal metastases and determine the frequency with which patients can be considered candidates for radical surgery (en bloc spondylectomy).
  
  
  METHODS
  Consecutive patients were classified accordingly to Enneking's and Tomita's schemes for grading vertebral involvement of metastases.
  
  
  RESULTS
  Fifty-one (51) consecutive patients were evaluated. Eighty-three percent of patients presented with the involvement of multiple vertebral levels and/or spinal canal invasion.
  
  
  CONCLUSIONS
  Because of diffuse vertebral involvement of metastases, no patients in this sample were considered to be candidates for radical spondylectomy of vertebral metastasis.
authors.affiliation: Department of Neurosurgery, Hospital do Servidor Público Estadual de São Paulo, IAMSPE, São Paulo, Brazil.
authors.forename: Ricardo Vieira
authors.initials: RV
authors.lastname: Botelho
authors.forename: Matheus Fernandes
authors.initials: MF
authors.lastname: de Oliveira
authors.forename: Jose Marcus
authors.initials: JM
authors.lastname: Rotta
keywords: Cancer; neoplasm metastasis; prognosis; spine; spondylectomy; surgical procedures.