Advanced Epithelioid Malignant Peripheral Nerve Sheath Tumor Showing Complete Response to Combined Surgery and Chemotherapy: A Case Report

Figure 4

Histological findings. (a) Proliferation of spindle cells with abnormal mitotic activities reminiscent of conventional malignant schwannoma (hematoxylin-eosin, ×400). (b), (c) Epithelioid features of round-to-polygonal or rhabdoid cells with cellular atypia resembling malignant melanoma (hematoxylin-eosin, ×400). (d) Immunohistochemical staining demonstrating strongly positive for S-100 protein.

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