
Resume Un cas de tumeur melanocytaire meningee primitive de grade intermediaire interessant la racine droite de C2 est presente. Cette rare entite peut etre evoquee en presence d’une lesion extra-axiale situee dans la fosse posterieure ou le canal cervical et presentant un raccourcissement des T1 et T2. Le diagnostic de certitude repose sur l’histologie qui montre de maniere caracteristique une proliferation de cellules melanocytaires fusiformes marquees par la coloration de la melanine et positives pour l’antigene HMB45. La cellularite, l’index mitotique, l’index de proliferation et le caractere invasif sont les principaux criteres permettant de classer cette lesion au sein des tumeurs melanocytaires meningees dont le spectre s’etend du melanocytome au melanome malin.
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