PMC8223517_01
(a) Eosinophilic, colloid-like content in the lumen of tubular formation of the tumor cells (HE, x10). (b) Expansive tumor growth toward the ovarian cortex (HE, x5).
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Tumor cells did not infiltrate the ovarian connective capsule (Figure 1).
Immunohistochemical analysis of the tumor. (a) CK, x10; (b) CK7, x10; (c) CD10, x10; (d) synaptophisin, x10; (e) EMA, x20; (f) estrogen, x20; (g) progesterone, x20; (h) Ki67, x20.
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Ki67 expression was less than 1% (Figure 2).