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Xanthogranulomatous pyelonephritisis (XGP) is a rare and aggressive form of chronic urinary tract infection. The most common microorganism is Proteus but other microorganisms have been described in the literature. In this article, we describe a sixty-year-old male who presented with urosepsis and sever thrombocytopenia secondary to Fusobacterium nucleatum urinary tract infection which led to poorly functioning XGP.The rarity of the microorganism and the devastating clinical course encourages us to report it as anaerobes don't usually cause UTI but unusual microorganism should be suspected if the clinical course is atypical or if urinary tract abnormalities are present.