Fig. 2

Pharyngeal metastasis and cervical lymph node metastasis following living-donor liver transplantation for hepatocellular carcinoma (HCC). a Macroscopic findings of a pedunculated polyp-shaped pharyngeal metastatic lesion. b Cervical computed tomography (CT) revealing a pharyngeal polyp on the right side of the epiglottis. c Faint fluorodeoxyglucose (FDG) accumulation consistent with the pharyngeal polyp as observed using FDG positron emission tomography (PET)-CT. d Histological examination showing polygonal dysplastic epithelial cells with a trabecular or pseudotubular structure that had proliferated under the mucous membrane covered with the squamous epithelium. e These tumor cells stained positively for anti-hepatocyte-specific antigen and were diagnosed as indicative of HCC metastasis. f Cervical CT showing regional neck lymph node swelling at 2 years after pharyngeal polypectomy. g PET-CT scan indicating that there was almost no FDG accumulation in the enlarged cervical lymph node