Radiation-Induced Peripheral Malignant Nerve Sheath Tumor Arising from Vestibular Schwannoma after Linac-Based Stereotactic Radiation Therapy: A Case Report and Review of Literatures
Figure 3
Histopathology of the first diagnosis of schwannoma (1(a), ×40), histopathology of the following specimen showing malignant peripheral nerve sheath tumor (MPNST) arising in schwannoma (1(b), ×40), MPNST with chondrosarcomatous component (1(c), ×40), MPNST with area composed of round cell tumor and brisk mitotic activity (1(d), ×100), MPNST with pleomorphic nuclei (1(e), ×400), MPNST with rhabdomyoblastic differentiation (1(f), ×400), MPNST showing immunonegativity for S-100 (1(g), X400), MPNST showing sarcomeric actin immunoreactivity (1(h), ×400), and MPNST with high Ki-67 immunohistochemistry (1(i), ×400).
