title: Osteosarcoma of the jaws: demographic and CT imaging features.
abstract: OBJECTIVE
  The aim of this study was to evaluate the patient demographic and CT imaging findings of primary osteosarcoma of the jaws.
  
  
  METHODS
  88 primary osteosarcomas of the jaws histopathologically diagnosed during 1997-2007 were reviewed. 21 cases of CT images were reviewed.
  
  
  RESULTS
  Of 88 patients, 51 (58%) had tumours in the mandible and 37 (42%) in the maxilla. The mean age was 37.8 years (range 9-80 years). The male-to-female ratio was 1.32:1. The mean age of patients with mandibular lesions was 41.04 years and in those with maxillary lesions it was 33.3 years. CT imaging findings were available in 21 patients. In the maxilla (n = 9), all tumours (100%) arose from the alveolar ridge. In the mandible (n = 12), most tumours (9 cases, 75%), arose from the ramus and/or condyle. All except two lesions had the epicentrum within the medullary cavity of the involved bone. The presence of periosteal reaction was demonstrated in 13 cases (62%). Soft-tissue extension was present in 18 lesions (86%), with calcification identified in 13 (72%).
  
  
  CONCLUSIONS
  This study provides age, sex distribution, location and CT imaging features of primary osteosarcoma of the jaws.
authors.affiliation: Department of Radiology, Shanghai Ninth People's Hospital, Medical School, Shanghai Jiao Tong University, China.
authors.forename: S
authors.initials: S
authors.lastname: Wang
authors.forename: H
authors.initials: H
authors.lastname: Shi
authors.forename: Q
authors.initials: Q
authors.lastname: Yu
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000539:Alveolar Process / Q000000981:diagnostic imaging; D001853:Bone Marrow / Q000000981:diagnostic imaging; D002114:Calcinosis / Q000000981:diagnostic imaging; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008335:Mandibular Condyle / Q000000981:diagnostic imaging; D008339:Mandibular Neoplasms / Q000000981:diagnostic imaging*; D008441:Maxillary Neoplasms / Q000000981:diagnostic imaging*; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D012516:Osteosarcoma / Q000000981:diagnostic imaging*; D010521:Periosteum / Q000000981:diagnostic imaging; D012737:Sex Factors; D012983:Soft Tissue Neoplasms / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult
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