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Seromucinous Borderline Tumor: Figures 12-15. The low power appearance resembles serous borderline tumor or MSBT (Figures 12-13). High power examination reveals columnar cells with apical mucin, endocervical-type cells, and cuboidal cells with dense cytoplasm (Figures 14-15). Note associated neutrophils. Submitted by Robert A. Soslow, MD