Fig. 1
a Chest CT. A mass shadow is present in the left upper lung field (arrow). b Fluorodeoxyglucose-positron emission tomography shows abnormal uptake in the left lung tumor, bilateral hilar lymph nodes, and left supraclavicular lymph nodes. c Neoplastic cells show hepatocellular-like differentiation and a partial pseudo-biliary tract pattern (hematoxylin and eosin staining). d Immunohistochemical staining for alpha-fetoprotein shows focal positivity. e Immunohistochemical staining for carcinoembryonic antigen shows focal positivity. f Immunohistochemical staining for glypican 3 shows focal positivity. g Immunohistochemical staining for hepatocyte-specific antigen shows focal positivity. h Immunohistochemical staining for protein induced by vitamin K shows focal positivity