Figure 2

Pathological findings of lymph node metastasis. (A, B) Poorly differentiated adenocarcinoma was observed, with tumour cells spreading into fibrosis stroma in the tumour tissue. Tumour cells contained acidophilic vacuoles and oval nuclear bodies with several clear nucleoluses and partially formed glandular differentiations. (C) Immunohistochemical staining for CK20 was positive. (D) Immunohistochemical staining for CK7 was negative. (E) Immunohistochemical staining for CDX2 was weak but diffusely positive.