title: Malignant lymphoma of the gingiva: MR evaluation.
abstract: OBJECTIVE
  Our purpose was to document the MR imaging findings of malignant lymphoma of the gingiva.
  
  
  METHODS
  Five patients with histologically proved malignant lymphoma of the gingiva were studied by MR imaging. The MR images were analyzed for tumor size, extent, and signal characteristics, bone involvement, and associated cervical lymph node enlargement.
  
  
  RESULTS
  Clinical examination tended to underestimate the size of lymphomatous lesions. The signal intensity of the lesions was isointense to hyperintense relative to muscle on noncontrast T1-weighted images and showed variable contrast enhancement patterns. On T2-weighted images, signal intensity was isointense to hypointense relative to the oral mucosa. In one case, the mass extended to the submandibular space; in the remaining cases, the masses were limited to the gingiva and the adjacent bone. MR imaging revealed that gingival lymphomatous masses were broad-based along the mandible or maxilla and eroded through the cortex into the marrow space, but the cortex was still recognizable. No nodal involvement was noted in any of the patients with malignant lymphoma.
  
  
  CONCLUSIONS
  The signal characteristics of gingival lymphoma overlap those of other tumors. The cortex separating marrow involvement from the broad-based gingival mass generally appears to be permeated with small erosions but is still recognizable.
authors.affiliation: Department of Radiology, Tokyo Medical and Dental University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yasumoto
authors.forename: H
authors.initials: H
authors.lastname: Shibuya
authors.forename: H
authors.initials: H
authors.lastname: Fukuda
authors.forename: M
authors.initials: M
authors.lastname: Takeda
authors.forename: T
authors.initials: T
authors.lastname: Mukai
authors.forename: T
authors.initials: T
authors.lastname: Korenaga
mesh_terms: D000368:Aged; D000539:Alveolar Process / Q000473:pathology; D001853:Bone Marrow / Q000473:pathology; D005887:Gingival Neoplasms / Q000175:diagnosis*; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology; D008223:Lymphoma / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness / Q000175:diagnosis