Terzic, M. (55519713300)M. (55519713300)TerzicDokic, M. (7004497269)M. (7004497269)DokicStimec, B. (7003411337)B. (7003411337)Stimec2025-06-132025-06-132005https://doi.org/10.1111/j.1525-1438.2005.15234.xhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-15444367288&doi=10.1111%2fj.1525-1438.2005.15234.x&partnerID=40&md5=8f121870b0f24da991060dbccc444426https://remedy.med.bg.ac.rs/handle/123456789/11076Immature teratomas of the ovary represent less than 1% of all ovarian teratomas. They contain several tissues that derive from the three embryologic layers: ectoderm, mesoderm, and endoderm. We report the case of a 17-year-old girl who presented with an immature teratoma of the left ovary that recurred 3 months later as an inoperable malignant neuroepithelial peritoneal tumor resembling a glioblastoma. She died 3 weeks after the second explorative operation. The very aggressive course and fast lethal outcome could be explained by the patient's refusal to receive chemotherapy after the initial operation. © 2005 IGCS.Immature teratomaLethal outcomeYoung girl