title: CT and MRI of fibrous dysplasia of the spine.
abstract: OBJECTIVE
  The purpose of this study was to present the CT and MRI findings of patients with fibrous dysplasia (FD) of the spine.
  
  
  METHODS
  Among the patients with pathologically proven skeletal FD, 12 (8 males and 4 females; mean age, 43 years) who were evaluated with either spine CT or MRI were included. The number and location of the involved vertebral segments, the presence of lytic lesions, ground-glass opacity (GGO), an expansile nature, cortical disruption, a sclerotic rim, a decrease in body height and contour deformity were examined on CT scans (n=12), while signal intensity, enhancement patterns and the presence of a dark signal rim on the lesion were examined using MRI (n=9).
  
  
  RESULTS
  Nine patients had polyostotic FD, including one with an isolated spinal localisation, while three had monostotic FD. An expansile nature (n=3) and osteolytic lesions with GGO (n=3) were seen. On CT images, GGO was noted in all patients. An expansile nature (n=11) and presence of lytic lesions (n=11) were noted. A decrease in body height (n=9) and sclerotic rim formation (n=9) were indicated. Contour deformities were visible in six patients. The MRI findings were non-specific. Dark signal rims were visible on MRI in seven patients.
  
  
  CONCLUSIONS
  Typical imaging findings of extraspinal FD were noted on spine CT scans. These characteristic CT imaging findings of spinal FD may be helpful in differentiating FD from other common spine diseases.
authors.affiliation: Department of Radiology, Pusan National University School of Medicine, Busan, Republic of Korea.
authors.forename: S K
authors.initials: SK
authors.lastname: Park
authors.forename: I S
authors.initials: IS
authors.lastname: Lee
authors.forename: J-Y
authors.initials: JY
authors.lastname: Choi
authors.forename: K H
authors.initials: KH
authors.lastname: Cho
authors.forename: K J
authors.initials: KJ
authors.lastname: Suh
authors.forename: J W
authors.initials: JW
authors.lastname: Lee
authors.forename: J W
authors.initials: JW
authors.lastname: Song
mesh_terms: D000328:Adult; D015331:Cohort Studies; D003287:Contrast Media; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D005260:Female; D005357:Fibrous Dysplasia of Bone / Q000000981:diagnostic imaging* / Q000473:pathology*; D006801:Humans; D007089:Image Enhancement; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D013122:Spinal Diseases / Q000000981:diagnostic imaging* / Q000473:pathology*; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D003287:Contrast Media