Sneathia amnii is an opportunistic pathogen of the female reproductive tract that has been reported to cause infections during pregnancy and in the post-partum period. Infections outside the reproductive tract have rarely been described. We report the case of a spondylitis due to S. amnii in a 72-year old woman, successfully treated after seven weeks of antimicrobial therapy. Growth of this pathogen guided our diagnosis towards a gynecological pathology; we discovered an endometrium adenocarcinoma. This case emphasizes the need for adequate incubation of discal biopsies, using aerobic and anaerobic enrichment broth with prolonged incubation.