dilated bile duct in pancreatic head.
1cm caudal,abrupt termination
of CBD due to cancer head of

pancreas.
Reference:BiblioMed Textbook-Computed Body Tomography

mildly dilated common bile duct.

1cm caudad become less narrowed.

1cm more caudal ,CBD become more narrowed(arrow).

enlarged head and uncinate process(u) of the pancreas

due to pancreatitis.

BiblioMed Textbook-Computed Body Tomography