Histology
MICROSCOPIC DESCRIPTION: Paraffin sections show a moderately hypercellular tumour composed of a mixture of spindle cells and cells with small round hyperchromatic nuclei and pale cytoplasm. Both cell types are arranged in diffuse sheets. Collections of haemosiderin-filled macrophages are identified. Foci of dystrophic calcification are noted. No mitotic figures are identified and there is no necrosis. Immunohistochemistry shows strong staining in tumour cells for S-100 protein and nestin. No staining for epithelial membrane antigen (EMA), progesterone receptor or E-cadherin is seen in tumour cells.
FINAL DIAGNOSIS: Spinal Neurilemmoma (Schwannoma).