Endometrial metaplastic ossification is a rare condition and can be partially explained by a neoformation in the endometrium, with calcium deposition. However, a common situation is the previous history of abortion with persistence of ossicles in the uterine cavity. The endometrial ossification was reported in a 31-year-old woman, without previous pregnancy or history of abortion. This patient presented dysmenorrhea and infertility. Pelvic ultrasonography showed a hyperechoic area in the uterine fundus. Histeroscopy was performed and an image suggestive of bone was seen. This tissue was removed by histeroscopy and the histopathological analysis confirmed endometrial ossification.