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Serous Borderline Tumor: Figures 1-6. Figure 1 depicts a serous borderline tumor composed of large and small papillae with minimal epithelial stratification. These features distinguish serous borderline tumor from serous cystadenofibroma. Figures 2-4 show more extensive tufting and evident hierarchical branching. Glands containing papillae embedded in stroma in Figure 3 are characteristic of serous borderline tumor. The cytologic features of serous borderline tumor are low grade (Figures 5 and 6). Submitted by Robert A. Soslow, MD