title: Giant cell tumor of the tendon sheath arising from a membrane surrounding the posterior arch of C1: a case report.
abstract: Giant cell tumor of the tendon sheath (GCTTS) is a common, benign lesion of the synovial membrane that occurs more often in large joints than in digits. Giant cell tumor of the tendon sheath rarely arises in close proximity to the axial skeleton.
  
  
  
  The purpose of the study was to report a rare case of GCTTS arising from the membrane surrounding the posterior arch of the atlas (C1).
  
  
  
  This is a case report.
  
  
  
  The methods involve clinical findings and review of current literature.
  
  
  
  In this report, we describe a rare case of GCTTS arising from the membrane surrounding the posterior arch of C1, with no apparent continuity with the facet joint. Here we show the radiographic features, with particular emphasis on positron emission tomography-computerized tomography scans, which have not been previously reported.
  
  
  
  We experienced an extremely rare case of GCTTS arising from the membrane surrounding the posterior arch of the C1 vertebra. In spite of the rarity of this disease, GCTTS should be considered in the differential diagnosis of the axial skeletal lesion. Awareness of GCTTS is important because its radiographic features may simulate other neoplastic lesions in the spine.
authors.affiliation: Department of Orthopaedic Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
authors.forename: Shutaro
authors.initials: S
authors.lastname: Yamada
authors.affiliation: Department of Orthopaedic Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan. Electronic address: oshimakazuya@gmail.com.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Oshima
authors.affiliation: Department of Orthopaedic Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Hamada
authors.affiliation: Department of Orthopaedic Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Sotobori
authors.affiliation: Department of Orthopaedic Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Joyama
authors.affiliation: Department of Orthopaedic Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Hashimoto
authors.affiliation: Department of Orthopaedic Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
authors.forename: Hidetatsu
authors.initials: H
authors.lastname: Outani
authors.affiliation: Department of Diagnostic Radiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Tanaka
authors.affiliation: Department of Diagnostic Radiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Nakanishi
authors.affiliation: Department of Orthopaedic Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
authors.forename: Nobuhito
authors.initials: N
authors.lastname: Araki
mesh_terms: D003937:Diagnosis, Differential; D005260:Female; D000070779:Giant Cell Tumor of Tendon Sheath / Q000000981:diagnostic imaging* / Q000209:etiology / Q000473:pathology; D006801:Humans; D008875:Middle Aged; D011877:Radionuclide Imaging