title: Dynamic multislice helical CT of maxillomandibular lesions: distinction of ameloblastomas from other cystic lesions.
abstract: OBJECTIVE
  To evaluate the clinical usefulness of dynamic multislice helical CT in differentiating ameloblastoma from other cystic lesions in cases of maxillomandibular cystic lesions.
  
  
  METHODS
  The study included 32 patients with maxillomandibular cystic lesions (ameloblastoma [n=6], myxofibroma [n=1], odontogenic keratocyst [n=3], dentigerous cyst [n=11], radicular cyst [n=11], and paradental cyst [n=2]). Dynamic study was performed before and 30 sec, and 90 sec after intravenous contrast medium administration. CT density values and percentage of density increase were calculated at 30 and 90 sec.
  
  
  RESULTS
  In five cases of ameloblastoma, a rapidly enhancing area was detected within the cystic lesions at 30 sec, while no apparent rapid enhancement was seen in the other cystic lesions. Three cysts showed gradual enhancement in the marginal area at 90 sec. Comparing ameloblastoma and other kinds of cysts, we found significant differences in the percentage of density increase at 30 sec (p<0.01) and 90 sec (p<0.05).
  
  
  CONCLUSIONS
  Dynamic multislice helical CT is useful in the diagnosis of cystic lesions of the maxillomandibular region, especially in the detection of neovascularities in ameloblastoma.
authors.affiliation: Department of Radiology, Jikei University School of Medicine, Tokyo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Tozaki
authors.forename: K
authors.initials: K
authors.lastname: Hayashi
authors.forename: K
authors.initials: K
authors.lastname: Fukuda
mesh_terms: D000328:Adult; D000564:Ameloblastoma / Q000000981:diagnostic imaging*; D003803:Dentigerous Cyst / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008339:Mandibular Neoplasms / Q000000981:diagnostic imaging*; D008441:Maxillary Neoplasms / Q000000981:diagnostic imaging*; D011842:Radicular Cyst / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*