Fig. 4

Pathological findings. The findings of hematoxylin and eosin staining are shown in a low-power field and b high-power field. Adenocarcinoma infiltrated the mucosal, submucosal, and muscular layers. Immunopathological findings of TTF-1 staining for the c appendix and d cervical lymph node are shown. The adenocarcinoma in the appendix and cervical lymph node showed positive staining for TTF-1