Yolk Sac Tumor of the Liver: An Important Differential for Liver Mass with Elevated Serum Alpha-Fetoprotein in the Pediatric Population.
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Introduction: Yolk sac tumor (YST) is a malignant germ cell tumor with 10-15% arising in extragonadal sites. Methods: A search through our institution's database from January 01, 1990, to December 31, 2020, for "yolk sac tumor" or "endodermal sinus tumor" and "liver". Results: Our search yielded three cases. A 20-month-old girl with a liver mass and serum alpha-fetoprotein (AFP) level of 46558.0 ng/mL. The neoplasm was papillary with Schiller-Duval bodies. A 2-year-old boy with hepatic masses and adrenal mass with a serum AFP of 106,604.5 ng/mL. Numerous Schiller-Duval bodies were present. A 7-month-old girl with a liver mass, lung nodules, and retroperitoneal masses. Serum AFP was in the 800s ng/mL. Hepatoid and microcystic YST were mixed with hepatoblastoma (HBL). All three cases were positive for CAM5.2, SALL4, Glypican-3, beta-catenin, and AFP. Conclusion: Hepatic yolk sac tumor should be considered in the differential of a liver mass in pediatric patients with elevated AFP.