Immature teratomas of the ovary represent less than 1% of all ovarian teratomas. Growing
teratoma syndrome is an increase of tumor size containing a mature teratoma component, during or after chemotherapy for
germ cell tumors
We report a case of an immature teratoma of the ovary in a 21-year-old girl treated by cystectomy only. She
presented a few months later with a pelvic mass with widespread diffuse peritoneal involvement exhibiting a spontaneous
growing teratoma syndrome.
Present case shows that spontaneous growing syndrome can occur in ovarian teratoma. Ovarian tumors in
young girl should be always considered as being potentially malignant to offer hope for curative treatment and fertility