Ovarian Yolk Sac Tumor Associated With Major Fibrosarcoma Component In A 13-Year-Old Girl

We are presenting a case of a 13-year-old girl with a chief complaint of lower abdominal pain. A computed tomographic scan showed a 10-cm right ovarian mass. The serologic testing showed high alpha-fetoprotein level. The patient underwent a right adnexectomy and an omentectomy. The final diagnosis was a yolk sac tumor with a major (95%) fibrosarcoma component, based on morphology and further confirmed by an extensive panel of immunohistochemistry. Postoperatively, the alpha-fetoprotein level dropped to normal. The patient completed 7 cycles of multiagent chemotherapy with cisplatin without major complications. At her 7-month follow-up, the patient still remains disease free. To our knowledge, our case is the first of its kind in the literature to document yolk sac tumor associated with fibrosarcoma in a teenage female. Owing to the rarity of this entity, the prognosis of this patient is widely unknown and it is yet still to be seen.