case_images: PMC9121450_01
case_images: CT axial plane (A) and coronal plane (B) showing dilated gallbladder and
  extrahepatic biliary system indicated by arrow heads.
case_images: 10.1177_2632010X221099884-fig1.jpg
case_images: PMC9121450_01_10.1177_2632010X221099884-fig1.jpg
case_images: fig1-2632010X221099884
case_images: The pancreatic duct was not dilated (Figure 1).
case_images: (A) Macroscopic view of the mucosal bulge at the ampulla of Vater and (B) cut
  sections through the pancreatic head reveal an irregular white tumour
  arising from common bile duct (arrowhead).
case_images: 10.1177_2632010X221099884-fig2.jpg
case_images: PMC9121450_01_10.1177_2632010X221099884-fig2.jpg
case_images: fig2-2632010X221099884
case_images: Cut sections through the pancreatic head revealed a 16 x 12 x 10 mm irregular, firm, white tumour just beneath the duodenal mucosa arising from the common bile duct close to the junction with the main pancreatic duct (Figure 2).
case_images: Microscopic view of AC and SCC junction ((A) - H&E section x100
  magnification; (B) - H&E section x200 magnification), (C)
  immunohistochemistry showing co-expression of CK7 in the AC component (x40
  magnification), (D) immunohistochemistry showing co-expression of CK5/6 in
  the SCC component (x100 magnification).
case_images: 10.1177_2632010X221099884-fig3.jpg
case_images: PMC9121450_01_10.1177_2632010X221099884-fig3.jpg
case_images: fig3-2632010X221099884
case_images: The tumour showed co-expression of CK7 and CK 5/6 (Figure 3).