Fig. 2

a The histopathological examination showed lobules of hyperplastic parathyroid tissues composed primarily of chief cells with thin delicate vascularity, nuclear monomorphism, central round nuclei and granular cytoplasm (200X, H &E stain), (b) 400X, H &E stain. c Immunohistochemically, the parathyroid tissues are positive for GATA-3, while negative for TTF-1, CD5 and thyroglobulin