title: Demyelinating disease simulating brain tumours: a histopathologic assessment of seven cases.
abstract: BACKGROUND
  Demyelinating diseases can present as space occupying lesions with in the brain. It is clinically and radiologically difficult to differentiate them from primary neoplasms. Histopathologically they mimic astrocytic neoplasms closely and identifying these lesions correctly has a profound impact in treatment and prognosis of these patients.
  
  
  OBJECTIVE
  The objective was to determine the histopathologic features of such acute focal demyelinating disease that clinically presented as brain tumors.
  
  
  METHODS
  Seven cases were included for the study. Detailed histopathological examination including stains for myelin and axon were performed. The histopathological keys in arriving at the right diagnoses included a well demarcated lesion that contains uniform distribution of foamy macrophages in the absence of any associated coagulative necrosis, sheets of gemistocytic astrocytes in the white matter that show well-formed processes, perivascular chronic inflammatory cell infiltration and total absence of myelin with relative preservation of axons within these areas.
  
  
  CONCLUSIONS
  The degree of suspicion (clinical, radiological and histopathological) should be high to diagnose these group of lesions. The above-mentioned diagnostic keys should help in arriving at the correct histopathological diagnoses of such cases.
authors.affiliation: Department of Histopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India. deepalipgi@rediffmail.com
authors.forename: Deepali
authors.initials: D
authors.lastname: Jain
authors.forename: L S
authors.initials: LS
authors.lastname: Rajesh
authors.forename: R K
authors.initials: RK
authors.lastname: Vasishta
authors.forename: B D
authors.initials: BD
authors.lastname: Radotra
authors.forename: A K
authors.initials: AK
authors.lastname: Banerjee
mesh_terms: D000328:Adult; D001932:Brain Neoplasms / Q000473:pathology*; D003937:Diagnosis, Differential; D005260:Female; D005910:Glioma / Q000473:pathology*; D006416:Hematoxylin; D006801:Humans; D007211:Indoles; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000473:pathology*; D010503:Periodic Acid-Schiff Reaction; D016708:Synaptophysin / Q000648:ultrastructure
chemical_list: D007211:Indoles; D016708:Synaptophysin; C018588:Luxol Fast Blue MBS; D006416:Hematoxylin