Primary extraskeletal Ewing’s sarcoma of the lumbar nerve root: A case report

Figure 2 Tissue diagnosis and immunohistochemistry results. A and B: Dark red, fish-like fleshy nerve root tumors were cut intraoperatively; C: Tumor boundaries were not clear, large areas of necrosis were visible, and tumor cells were segmented by fibrous tissue and exhibited a nest-like structure; D: Cells were round, nuclei were vacuolar, and cytoplasm was sparse; E and F: Mitotic observations were consistent with small round cell malignancy. Immunohistochemistry showed positivity for CD99 and S100.