Figure 2. Microscopic findings of right ovarian tumor. (A) Condensed hyperplastic round and oval cells forming a glandular structure (arrow). The cells’ nuclei were pleomorphic, hyperchromatic, and partially vascular, with clear nuclear daughter cells and mitosis. The tumor mass partially showed squamous differentiation. The surrounding fibro-collagenous connective tissue stroma was filled with lymphocytes, dilated blood vessels, and blood. (B) Visible invasion of malignant tumor cells into the lymph vasculature. Extensive areas of necrosis were also seen. Transitional cell differentiation was seen in the cyst wall of the right ovarian tumor mass (arrow).