title: [Contribution of immunohistochemistry and electron microscopy for the diagnosis of meningeal hemangiopericytomas. 15 case reports].
abstract: Meningeal hemangiopericytomas (HPC) are rare CNS tumors with a pour prognosis compared to meningiomas. In order to define diagnosis criteria, we performed an immunohistochemical and ultrastructural study in respectively 15 and 5 meningeal HPC. The following antibodies anti-KL1, EMA, vimentin, CD34, factor VIII, alpha-smooth actin, estrogen and progesteron receptors (RE, RP) were used in paraffin embedded sections whereas anti-NCAM and E-cadherin antibodies were used on frozen sections when available. We can differentiate meningeal HPC from meningioma because of a complete lack of immunostaining with epithelial markers as well as with NCAM antibody or RE and RP receptors. Besides a positivity with CD34 and alpha-smooth actin antibodies was always observed even focally in HPC. On the other hand, solitary fibrous tumor showed a strong and diffuse positivity with anti CD34 and anti-vimentin antibodies. Electron microscopy can be helpful in some instances showing membrane basal-like substance and absence of desmosomes.
authors.affiliation: Service d'Anatomie Pathologique et de Neuropathologie, CHU Timone, Marseille.
authors.forename: C
authors.initials: C
authors.lastname: Bouvier-Labit
authors.forename: A
authors.initials: A
authors.lastname: Liprandi
authors.forename: M D
authors.initials: MD
authors.lastname: Piercecchi
authors.forename: H
authors.initials: H
authors.lastname: Hosseini
authors.forename: D
authors.initials: D
authors.lastname: Hénin
authors.forename: D
authors.initials: D
authors.lastname: Figarella-Branger
mesh_terms: D000328:Adult; D000368:Aged; D015415:Biomarkers / Q000032:analysis; D001921:Brain / Q000473:pathology* / Q000648:ultrastructure; D003896:Desmosomes / Q000473:pathology / Q000648:ultrastructure; D003937:Diagnosis, Differential; D005260:Female; D006393:Hemangiopericytoma / Q000473:pathology* / Q000648:ultrastructure; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008577:Meningeal Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D008579:Meningioma / Q000473:pathology* / Q000648:ultrastructure; D008854:Microscopy, Electron; D008875:Middle Aged
chemical_list: D015415:Biomarkers