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Lymph node involvement: Figures 16-19. Benign Mullerian serous inclusions (endosalpingiosis) are shown in Figure 16. Figure 17 contrasts serous borderline tumor (upper right) with endosalpingiosis (lower left). Endocervicosis, benign Mullerian endocervical-type inclusions, is depicted in Figure 18. Mesothelial cells in subcapsular sinuses, illustrated in Figure 19, can cause diagnostic confusion with serous borderline tumor and metastatic carcinoma. Submitted by Robert A. Soslow, MD