Yolk sac tumors are highly malignant and commonly affect the ovaries, with a median age of occurrence of 23 years. We describe the case of an ovarian yolk sac tumor in a 12-year-old premenarchal girl suffering from Hashimoto's thyroiditis and chronic spontaneous urticaria, which presented as a rapidly growing solid cystic formation in the hypogastrium with an extreme increase in alpha fetoprotein (52,778 mg/ml). After ultrasound and MRI imaging, fertility-sparing staging surgery was performed, and the diagnosis of an ovarian yolk sac tumor with positive malignant cells in ascites was confirmed.
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