Fig. 2.

Tumor histology of the biopsy specimen. Tumor cells were proliferating in the fibrous stroma, but alternating fibrous and myxoid areas were unclear (A). Some of the tumor cells showed wavy nuclei, and nuclear atypia was not evident on high-power view (B). Degenerative area with focal necrosis was present at the periphery of the tumor (C). Immunohistochemically, tumor cells were negative for S-100 protein (D).