title: Intracranial olfactory neuroblastoma: evidence for olfactory epithelial origin.
abstract: OBJECTIVE
  To determine the possible histogenesis of the intracranial variant of olfactory neuroblastoma.
  
  
  METHODS
  Four specimens from three cases of intracranial olfactory neuroblastoma were studied by light microscopy and immuno-histochemistry, and electron microscopy in two cases.
  
  
  RESULTS
  Light microscopical examination showed small cell tumour with additional features of epithelioid cells in one case and ganglion cells in another. Olfactory and Homer-Wright rosettes were present. All the specimens showed a uniform positive reaction to neurone specific enolase, S-100, and cytokeratin antibodies. Glial fibrillary acidic protein was absent. The salient electron microscopic features were the presence of cell junctions, cytoplasmic intermediate filaments, basal bodies and cytolasmic processes. Dense cored vesicles were absent.
  
  
  CONCLUSIONS
  The results strongly support the view that intracranial olfactory neuroblastomas are of olfactory epithelial origin and differ from conventional neuroblastomas.
authors.affiliation: Department of Pathology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Banerjee
authors.forename: B S
authors.initials: BS
authors.lastname: Sharma
authors.forename: R K
authors.initials: RK
authors.lastname: Vashista
authors.forename: V K
authors.initials: VK
authors.lastname: Kak
mesh_terms: D000328:Adult; D001932:Brain Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000648:ultrastructure; D003388:Cranial Fossa, Posterior; D006801:Humans; D007124:Immunoenzyme Techniques; D007633:Keratins / Q000032:analysis; D008297:Male; D018241:Neuroectodermal Tumors, Primitive, Peripheral / Q000737:chemistry / Q000473:pathology* / Q000648:ultrastructure; D010751:Phosphopyruvate Hydratase / Q000032:analysis; D009418:S100 Proteins / Q000032:analysis
chemical_list: D009418:S100 Proteins; D007633:Keratins; D010751:Phosphopyruvate Hydratase