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Figure 2: Serous borderline tumor with microinvasion: Eosinophilic cell pattern of microinvasion, characterized by individual cells or small, irregular clusters of cells with abundant eosinophilic cytoplasm within the stromal stalks of serous papillae. The surrounding stroma exhibits no reaction, and the tumor cells are surrounded by clefts (A, H&E, ×200; B, H&E, ×100)

Figure 2: Serous borderline tumor with microinvasion: Eosinophilic cell pattern of microinvasion, characterized by individual cells or small, irregular clusters of cells with abundant eosinophilic cytoplasm within the stromal stalks of serous papillae. The surrounding stroma exhibits no reaction, and the tumor cells are surrounded by clefts (A, H&E, ×200; B, H&E, ×100)