Fig. 1

Pathology results of the biopsy. HE images demonstrated that the epithelioid tumor cells were arranged in cords and beams within a dense collagenous stroma. The tumor cells exhibited a relatively uniform epithelioid morphology, with cytoplasm that was abundant and stained eosinophilic to lightly. Clear cytoplasm, round nuclei, and small nucleoli were observed focally. Additionally, focal areas displayed cellular polymorphism and mitotic figures, while necrosis was also evident in certain regions