Fig. 2
From: Metastasis of colon cancer to the thyroid and cervical lymph nodes: a case report
Histopathological and immunohistochemical (IHC) staining findings of the thyroid. a Gross findings reveal an ill-defined white diffuse mass. b Microscopic findings show cribriform nests of tall columnar cells accompanied by necrosis (H&E stain, ×400). c IHC staining for TTF-1 reveals negative staining in the tumor cells. d IHC staining for cytokeratin 7 shows negative staining in the tumor cells. e IHC staining for cytokeratin 20 shows cytoplasmic positivity in the tumor cells