Figure 4. Ascitic fluid cytology (A) and histological (B) and immunohistochemical (C-E) findings of the right ovarian tumor at the time of the first surgery.

(A) Cytology of the ascites shows many tumor cells suggesting mucin production, diagnosed as a mucinous borderline tumor, with slightly cellular atypia (Papanicolaou stain, x 200); (B) High columnar epithelia formed papillary structures in the cyst lumen. The tumor cells are stratified, and the tumor is diagnosed as a mucinous borderline tumor (H&E stain, x 20); (C) Immunohistochemical staining for CK7 is positive in the tumor cells (x 20); (D) Immunohistochemical staining for CK20 is also positive (x 20); (E) Immunohistochemical staining for p53 was partially and weakly positive in the tumor cell nuclei (x 20).