Résumé
Les tumeurs à petites cellules (ou carcinomes à petites cellules, ou carcinomes endocrines à petites cellules) sont des tumeurs malignes endocrines peu différenciées, dont la localisation primitive est surtout pulmonaire. Les primitifs extrapulmonaires sont toutefois connus de longue date (1) et peuvent être de site urologique, en particulier vésical ou prostatique. La majorité des tumeurs urologiques endocrines sont en fait mixtes, avec un contingent tumoral endocrine et un autre épithélial. Il n’y a pas de consensus sur le pourcentage de composante endocrine qui serait nécessaire pour retenir le diagnostic. De même, il peut y avoir une variabilité au cours du temps de la proportion du contingent endocrine, qui devient progressivement prédominant, notamment au cours de l’évolution d’un cancer de la prostate initialement mixte. Les formes de tumeurs à petites cellules d’emblée pures existent mais sont nettement plus rares. Dans ces cas, il peut être nécessaire de vérifier que la localisation urologique n’est pas une métastase d’un primitif bronchique (2).
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Théodore, C. (2010). Localisation uro-génitale. In: Tumeurs malignes rares. Springer, Paris. https://doi.org/10.1007/978-2-287-72070-3_37
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DOI: https://doi.org/10.1007/978-2-287-72070-3_37
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