RESUMELe séminome spermatocytaire est une tumeur rare, représentant moins de 2% des cancers du testicule, survenant essentiellement chez le sujet âgé. Nous rapportons une nouvelle observation d'un patient âgé de 48 ans. La tumeur se présentait comme une prolifération de cellules en nappes compactes, avec 3 types cellulaires, des cellules de petite taille, des cellules intermédiaires et des grandes cellules. Il n'a été retrouvé ni contingent sarcomateux, ni séminome classique. L'analyse en immun histochimie n'a retrouvé aucune expression des cellules tumorales pour les anticorps classiques testés, notamment l'Ac anti PLAP et les marqueurs lymphoïdes. Le séminome spermatocytaire doit être reconnu, car son évolution est très favorable et ne nécessite qu'une simple orchidectomie, en l'absence d'un exceptionnel contingent sarcomateux ou de métastase où une chimiothérapie s'impose. ABSTRACTSpermatocytic seminoma is a rare tumor, representing less than 2 % of testicular cancer, occurring mainly in elderly men. We report a case of a 48-year-old male. The tumor appeared as a cells proliferation in compact sheets with 3 cell types, small cell size, intermediate cells and large cells. It has been found neither sarcomatous contingent nor classic seminoma. Immunohistochemically, all markers examined were negative, especially anti PLAP and lymphoid markers. Spermatocytic seminoma must be recognized, because its evolution is very favorable and requires only a simple orchidectomy, in the absence of a special sarcomatous transformation or metastasis for which chemotherapy is needed.
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