Fig. 4
From: Collision tumor of a papillary and follicular thyroid carcinoma: a case report
Findings of IHC. a The image of hematoxylin–eosin staining. The left side is FTC, and the right side is PTC (× 100). b IHC of TTF-1 (× 100). Both of FTC and PTC are positively stained. c IHC of CK19 (× 100). The tumor cells of PTC are positively stained whereas the tumor cells of FTC are negative. d IHC of BRAF (V600E) (× 100). The tumor cells of PTC are positively stained whereas the tumor cells of FTC are negative