title: Ossifying intramuscular metastasis from colon cancer: report of a case.
abstract: OBJECTIVE
  This report presents a patient who developed severe buttock pain because of an ossified intramuscular metastasis from a sigmoid colon cancer.
  
  
  METHODS
  This is a case report and review of the literature for intramuscular metastasis from colon cancer.
  
  
  RESULTS
  Computed tomography and magnetic resonance imaging showed a soft-tissue mass with heavy calcification. Histologically, mature compact bone was observed with adenocarcinoma cells dispersed among the bony trabeculae.
  
  
  CONCLUSIONS
  When an intramuscular mass is seen, even if it contains extensive calcification, metastasis from colon cancer should be included in differential diagnosis.
authors.affiliation: Department of Orthopaedic Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yoshikawa
authors.forename: M
authors.initials: M
authors.lastname: Kameyama
authors.forename: T
authors.initials: T
authors.lastname: Ueda
authors.forename: I
authors.initials: I
authors.lastname: Kudawara
authors.forename: K
authors.initials: K
authors.lastname: Nakanishi
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology / Q000556:secondary*; D002081:Buttocks; D003110:Colonic Neoplasms / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D019042:Muscle Neoplasms / Q000473:pathology / Q000556:secondary*; D009999:Ossification, Heterotopic / Q000473:pathology*; D012983:Soft Tissue Neoplasms / Q000473:pathology / Q000556:secondary*