Histopathology:
Macroscopy:
Specimen consists of multiple fragments of tissue, the largest measuring 40 x 20 x 15 mm.
Microscopy:
Sections show multiple tissue fragments demonstrating a tumour composed of hypercellular areas( Antoni A) and a myxoid pauci-cellular (Antoni B). The cells are spindle-shaped, with tapered nuclear ends and eosinophilic cytoplasm. Nuclear palisading around fibrillary processes (Verocay bodies) is often seen. Scattered mast cells and blood vessels are seen. Isolated large cells with hyperchromatic nuclei are noted. There is no evidence of malignancy.
Immunohistochemistry:
s100: diffusely positive
Pathologic diagnosis consistent with schwannoma