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Mimics of serous borderline tumor: Figures 24-27. High grade serous carcinomas may, on occasion, grow in a non-invasive pattern and therefore mimic serous borderline tumor at low power (Figure 24). Severe cytologic atypia (grade 3 of 3) is shown at high power in Figure 25. This is incompatible with a diagnosis of serous borderline tumor. Figures 26 and 27, both micropapillary tumors, show nuclear atypia that exceeds what many pathologists would accept in a borderline tumor. Submitted by Robert A. Soslow, MD