title: CT and MR imaging in primary cerebral non-Hodgkin's lymphoma.
abstract: OBJECTIVE
  To determine the morphological appearance and topographical distribution of primary cerebral non-Hodgkin's lymphoma (NHL).
  
  
  METHODS
  CT and MR examinations of 68 patients with primary cerebral NHL were analyzed. The NHLs were classified by the Kiel classification and immunohistological data, as centroblastic (25), immunoblastic (24), lymphoblastic (5), Burkitt (1), non-subclassifiable type B (11), and T-cell lymphoma (2).
  
  
  RESULTS
  Centroblastic lymphomas tended to predominate in the parietal lobe (56.5%) and the corpus callosum (59.1%) while immunoblastic lymphomas were mainly distributed in the frontal lobe (52.8%). About 2/3 of all NHLs showed a multifocal occurrence. Important for differential diagnosis, ventricular involvement was proved in 83.3% of these cases. In the remaining 26 patients with a solitary lymphoma, a periventricular location could be detected in only 8 cases. Central necroses were frequent in HIV-positive patients (7/11, 63.6%) but rare in the HIV-negative patients (9/57, 15.8%). On T2-weighted SE MR images, 8/11 centroblastic lymphomas gave a signal that was isointense with, or lower than, that of the contralateral white matter, while 8/10 immunoblastic lymphomas gave a higher signal.
  
  
  CONCLUSIONS
  The radiological finding of multifocal brain lesions with ventricular involvement is relatively specific for primary cerebral NHL. However, subclassification on the basis of the CT or MR imaging results is not yet possible.
authors.affiliation: Department of Diagnostic Radiology, University of Cologne, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Lanfermann
authors.forename: W
authors.initials: W
authors.lastname: Heindel
authors.forename: J
authors.initials: J
authors.lastname: Schaper
authors.forename: R
authors.initials: R
authors.lastname: Schröder
authors.forename: M L
authors.initials: ML
authors.lastname: Hansmann
authors.forename: R
authors.initials: R
authors.lastname: Lehrke
authors.forename: R I
authors.initials: RI
authors.lastname: Ernestus
authors.forename: K
authors.initials: K
authors.lastname: Lackner
mesh_terms: D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008228:Lymphoma, Non-Hodgkin / Q000145:classification / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed