The paper covers the problems of diagnosis of germinogenic ovarian tumors in girls, which make up as high as 80% of all malignant ovarian tumors. For timely diagnosis, it is necessary to take into account clinical data, the levels of tumor markers (alpha-fetoprotein, chorionic gonadotropin) and ultrasound findings. This all is rather sufficient to verify the diagnosis of ovarian tumor lesions. Other additional studies are aimed at establishing where the process extends.