title: Synovial chondromatosis of the tempromandibular joint: relationship between MRI information and potential aggressive behavior.
abstract: OBJECTIVE
  To evaluate the types of synovial condromatosis (SC) of tempromandibular joint (TMJ) on MRI and their potential aggressive behavior.
  
  
  METHODS
  144 patients with pure SC of TMJ were included in. On MRI, 3 types of the lesion included loose body, homogeneous mass, and mixture of both loose body and homogeneous mass. Bony evaluations included 4 stages of erosion: without erosion, chondral breakdown, bony absorption and bony perforation.
  
  
  RESULTS
  47 (32.6%) cases were categorized in the type of loose body, 71 (49.3%) cases in the type of homogeneous mass, and 26 (18.1%) cases in the type of mixture. 80% of bony perforation belonged to the type of homogeneous mass and 20% belonged to the type of mixture. 2 patients were found recurrence.
  
  
  CONCLUSIONS
  The types of homogeneous mass and mixture of both on MRI were more aggressive. Homogeneous mass with bony erosion on MRI had potential recurrence.
authors.affiliation: Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.
authors.forename: Min-jie
authors.initials: MJ
authors.lastname: Chen
authors.affiliation: Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China. Electronic address: yangchi63@hotmail.com.
authors.forename: Chi
authors.initials: C
authors.lastname: Yang
authors.affiliation: Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.
authors.forename: Ya-ting
authors.initials: YT
authors.lastname: Qiu
authors.affiliation: Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Jiang
authors.affiliation: Department of Radiology, Ninth People's Hospital, Shanghai Jiao Tong University, Shanghai 200011, China.
authors.forename: Hui-min
authors.initials: HM
authors.lastname: Shi
authors.affiliation: Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.
authors.forename: Wen-bin
authors.initials: WB
authors.lastname: Wei
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001182:Arthroscopy / Q000379:methods; D001853:Bone Marrow / Q000473:pathology; D001862:Bone Resorption / Q000175:diagnosis / Q000473:pathology; D002358:Cartilage, Articular / Q000473:pathology; D015838:Chondromatosis, Synovial / Q000175:diagnosis* / Q000473:pathology; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007594:Joint Loose Bodies / Q000175:diagnosis / Q000473:pathology; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013701:Temporal Bone / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis* / Q000473:pathology; D055815:Young Adult
keywords: Aggressive behavior; Bony perforation; MRI; Synovial condromatosis; Tempromandibular joint