title: Coccydynia due to a benign notochordal cell tumor.
abstract: METHODS
  Case report.
  
  
  OBJECTIVE
  To present a rare case of a notochordal cell tumor.
  
  
  BACKGROUND
  We report on a 27-year-old female patient with pain at the lower back and muscle cramps in the area of the right hip. Image studies demonstrated a cystic lesion of the coccyx.
  
  
  METHODS
  As clinical symptoms became chronic and were resistant to conservative treatment, a resection of the coccyx was performed.
  
  
  RESULTS
  Histology revealed an intraosseous benign notochordal cell tumor. This tumor represents a recently described notochordal cell proliferation biologically distinct from chordomas.
  
  
  CONCLUSIONS
  Overdiagnosis of these notochordal cell proliferations as chordomas may occur if clinicians and pathologists are unfamiliar with the spectrum of notochordal proliferations.
authors.affiliation: Trauma Department, Hannover Medical School, Germany. Haasper.carl@mh-hannover.de
authors.forename: Carl
authors.initials: C
authors.lastname: Haasper
authors.forename: Florian
authors.initials: F
authors.lastname: Länger
authors.forename: Herbert
authors.initials: H
authors.lastname: Rosenthal
authors.forename: Karsten
authors.initials: K
authors.lastname: Knobloch
authors.forename: Eckart
authors.initials: E
authors.lastname: Mössinger
authors.forename: Christian
authors.initials: C
authors.lastname: Krettek
authors.forename: Leonhard
authors.initials: L
authors.lastname: Bastian
mesh_terms: D000328:Adult; D003050:Coccyx / Q000601:surgery; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D017116:Low Back Pain / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D009373:Neoplasms, Germ Cell and Embryonal / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D009672:Notochord / Q000473:pathology; D013125:Spinal Neoplasms / Q000150:complications* / Q000175:diagnosis / Q000601:surgery