title: MRI of mucosal malignant melanoma of the head and neck.
abstract: OBJECTIVE
  The objective of this study was to determine the characteristic MR findings for mucosal malignant melanomas of the head and neck.
  
  
  METHODS
  We retrospectively analyzed the MR images for six patients with this entity. T1-weighted SE images with and without gadolinium and T2-weighted fast SE images were obtained. MR images were analyzed qualitatively and quantitatively by comparing the signal intensity of the melanoma with that of muscle.
  
  
  RESULTS
  On T1-weighted images, five melanomas were hyperintense and one was isointense. On T2-weighted images, five were of mixed intensity and one showed isointensity. The mean signal intensity ratio of the primary melanoma to muscle was 1.51 and 1.39 on T1-weighted images with and without gadolinium, respectively. These values were not statistically significant.
  
  
  CONCLUSIONS
  Hyperintensity on T1-weighted images is characteristic of this entity, but not universal.
authors.affiliation: Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yoshioka
authors.forename: T
authors.initials: T
authors.lastname: Kamada
authors.forename: S
authors.initials: S
authors.lastname: Kandatsu
authors.forename: M
authors.initials: M
authors.lastname: Koga
authors.forename: K
authors.initials: K
authors.lastname: Yoshikawa
authors.forename: Y
authors.initials: Y
authors.lastname: Matsuoka
authors.forename: J
authors.initials: J
authors.lastname: Mizoe
authors.forename: Y
authors.initials: Y
authors.lastname: Itai
authors.forename: H
authors.initials: H
authors.lastname: Tsujii
mesh_terms: D000273:Adipose Tissue / Q000473:pathology; D000328:Adult; D000368:Aged; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D005887:Gingival Neoplasms / Q000175:diagnosis / Q000473:pathology; D006258:Head and Neck Neoplasms / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging; D008297:Male; D008543:Melanins / Q000032:analysis; D008545:Melanoma / Q000175:diagnosis* / Q000473:pathology; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000473:pathology; D009296:Nasal Cavity / Q000473:pathology; D009303:Nasopharyngeal Neoplasms / Q000175:diagnosis / Q000473:pathology; D009669:Nose Neoplasms / Q000175:diagnosis / Q000473:pathology; D009959:Oropharyngeal Neoplasms / Q000175:diagnosis / Q000473:pathology; D010157:Palatal Neoplasms / Q000175:diagnosis / Q000473:pathology; D012189:Retrospective Studies
chemical_list: D003287:Contrast Media; D008543:Melanins; D019786:Gadolinium DTPA