A case of ependymoma arising from the peritoneum

Ependymoma arising from the peritoneum is extremely rare. We present the case of a 23-year-old woman who underwent urgent laparoscopic surgery because of a pelvic mass and intraperitoneal bleeding. Although peritoneal carcinoma was suspected, pathological re-examination revealed ependymoma with a perivascular pseudorosette and positive for glial fibrillary acidic protein. Residual tumor extraction indicated that the ependymoma had developed from the peritoneum. This case highlights the need to consider ependymoma as a potential diagnosis in young women with suspected ovarian or peritoneal cancer.