Fig. 2
From: Recurrent granular cell tumor of the thyroid: a case report and literature review
Histopathological examination. a Tumor cells consisted of uniformly shaped cells containing an abundance of eosinophilic granular cytoplasm with round or oval nuclei. The yellow arrow indicated tumor tissue infiltration into striated muscle tissue (HE×100); b Tumor cells tested strongly positive for S-100 protein. (Immunohistochemical staining, × 200); c Tumor cells tested negative for Desmin. (Immunohistochemical staining, × 200)