Non-Epstein-Barr virus associated lymphoepithelioma-like carcinoma of the inferior common bile duct

Figure 1 Computed tomography showing a pancreas head tumor, measuring 30 mm × 20 mm, and a dilated common bile duct.

Figure 2 Histopathological findings. A: Nests of undifferentiated cells in a background of dense lymphoplasmacytic infiltration (hematoxylin and eosion stain, × 100); B: Undifferentiated tumor cells with irregular large vesicular nuclei with nucleoli, and densely infiltrated lymphocytes and plasma cells that appear mature (hematoxylin and eosion stain, × 200); C: Focal glandular differentiation is present (hematoxylin and eosion stain, × 100).

Figure 3 Immunohistochemical findings. A: CA19-9 expression in tumor cells (× 100); B: Overexpression of p53 protein in tumor cells (× 40).