Figure 3.

The microscopic features of the granular cell tumour were: (A) Round polygonal granular cells observed in nests, divided by fibrous septa; (B) The tumour had an infiltrating margin; (C) The nuclei were small and dark. The cytoplasm was eosinophilic fine to coarsely granular; (D) The granular cell tumour arose from the nerve bundles; (E) Histochemical stain showed the granules represent phagolysosomes which were strongly Periodic Acid Schiff (PAS) positive and diastase-resistant; (F) Immunohistochemsitry was strongly positive for S100.