title: CT and MR imaging features of oral and maxillofacial hemangioma and vascular malformation.
abstract: OBJECTIVE
  To present CT and MR images and compare CT and MRI features of oral and maxillofacial hemangioma and vascular malformation.
  
  
  METHODS
  The clinical materials consisted of nine vascular tumors from nine patients examined by both CT and MR scanners between November 1996 and March 2002. Both CT and MR images were retrospectively evaluated. The following features were evaluated: detectability of the lesion, border of the lesion, tumor margin, inner nature of the lesion, contrast between the lesion and surrounding tissues, degree of CT value or signal intensity of the lesion, enhancement of contrast medium, inner nature of the lesion after contrast medium injection, detectability of phleboliths and detectability of bone resorption.
  
  
  RESULTS
  In two patients, we could not detect lesions in any of the CT images because of artifacts from the teeth and/or dental restorations. In contrast, we could detect all lesions on T2-weighted MR images and contrast enhanced T1-weighted MR images. On T2-weighted images with the fat suppression technique, tumors tended to show higher contrast compared to surrounding tissues.
  
  
  CONCLUSIONS
  T2-weighted images with the fat suppression technique and contrast enhanced T1-weighted images with the fat suppression technique were very useful for the detection of vascular lesions. Observation from optional directions (axial, coronal and sagittal images) seemed appropriate for delineating the extension of the tumor. Phleboliths detectability on CT images was superior to that on MR images.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan. kakimoto@dent.osaka-u.ac.jp
authors.forename: Naoya
authors.initials: N
authors.lastname: Kakimoto
authors.forename: Keiko
authors.initials: K
authors.lastname: Tanimoto
authors.forename: Hideyoshi
authors.initials: H
authors.lastname: Nishiyama
authors.forename: Shumei
authors.initials: S
authors.lastname: Murakami
authors.forename: Souhei
authors.initials: S
authors.lastname: Furukawa
authors.forename: Sven
authors.initials: S
authors.lastname: Kreiborg
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001165:Arteriovenous Malformations / Q000175:diagnosis* / Q000000981:diagnostic imaging; D002648:Child; D003287:Contrast Media; D005153:Facial Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D005260:Female; D019786:Gadolinium DTPA; D006391:Hemangioma / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D007472:Iohexol; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media; D007472:Iohexol; D019786:Gadolinium DTPA