This 42-year-old woman had a pelvic mass discovered during her annual physical exam. A 15.0 cm right ovarian tumor was removed at surgery. The cut surface of the tumor was tan, markedly hemorrhagic and multicystic. There were no discernible papillary excrescences. Immunohistochemical stains performed on representative tumor sections showed: a-fetoprotein +, PLAP +, β-HCG –, CK7 –, EMA –, AE1/AE3 +.
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• Clear cell carcinoma
• Embryonal carcinoma
• Endometrioid adenocarcinoma
• Yolk sac tumor
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• Appropriate diagnosis
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