micropapillary borderline serous tumor


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  • Histology

    • thin micropapillae emanating from large papillary core
    • absent cilia

  • Stains

    • positive: AE1AE3, EMA, BerEp4, WT1, PAX8, ER, PR
    • negative for diffuse p16 and p53 mutation

  • Molecular

    • KRAS, BRAF mutations in 50%
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