title: [Ultrastructure of achromic malignant melanoma of the gingiva. value in differential diagnosis].
abstract: The authors report a case of a large oral tumour. On the basis of classical histological and histochemical techniques, the diagnosis was oriented towards an angiosarcoma though it was not possibile to eliminate an achromic melanoma. Ultrastructural studies demonstrated the presence of premelanosomes and established the diagnosis of an achromic malignant melanoma. The clinical interest of this approach isthus emphasised.
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D005260:Female; D005881:Gingiva / Q000648:ultrastructure*; D005887:Gingival Neoplasms / Q000175:diagnosis / Q000648:ultrastructure*; D006801:Humans; D008545:Melanoma / Q000175:diagnosis / Q000648:ultrastructure*
vernacular_title: Ultrastructure du mélanome malin achromique de la gencive. Intérêt en diagnostic différentiel.