title: [Pleomorphic adenoma. Diagnostic difficulties. Value of ultrastructural and immunohistochemical studies. Apropos of 2 cases].
abstract: 2 cases of pleomorphic adenoma with unusual histological feature are related. In the 1st case, the tumor was mistaken for a schwannoma. The electron microscopic study only permitted the diagnosis; in the 2nd case, the tumor, obviously malignant, was firstly diagnosed as synovial sarcoma; in this case also, ultrastructural study permitted to recognize a malignant mixed tumor with an unusual "sarcomatous" change of its myoepithelial component.
authors.affiliation: Service d'Anatomie pathologique, Hôpital de la Pitié, Paris.
authors.forename: G
authors.initials: G
authors.lastname: Chomette
authors.forename: M
authors.initials: M
authors.lastname: Auriol
authors.forename: F
authors.initials: F
authors.lastname: Guilbert
mesh_terms: D008949:Adenoma, Pleomorphic / Q000276:immunology / Q000601:surgery / Q000648:ultrastructure*; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D009442:Neurilemmoma / Q000175:diagnosis; D010307:Parotid Neoplasms / Q000276:immunology / Q000601:surgery / Q000648:ultrastructure*; D013584:Sarcoma, Synovial / Q000175:diagnosis
vernacular_title: Adénome pléomorphe. Difficultés diagnostiques. Intérêt de l'étude ultrastructurale et immunohistochemique. A propos de deux observations.