Gliomatosis peritonei, the implantation of neuroglial tissue upon the peritoneal surface, is a rare event most often associated with solid or immature teratoma of the ovary in young girls. The majority of cases occur in association with teratomas containing immature element. However malignant transformation of the glial tissue has been reported. Here we experienced a case of mature glial implants presenting in an 27-year-old female, 10 years after initial diagnosis and removal of an ovarian immature teratoma, and report this case with brief review of literatures.