crescent sign

s=soft tissue density calculus surrounded by

by a crescent area of water density bile

D=duodenum.

Reference:BiblioMed Textbook-Computed Body Tomography

Target sign

arrow=soft tissue density calculus surrounded by

a zone of water density bile(arrow head).

open arrow=dilated pancreatic duct in uncinate process.

Reference:BiblioMed Textbook-Computed Body Tomography

soft tissue density calculus

d=duodenum.

Reference:BiblioMed Textbook-Computed Body Tomography

arrow=CBD calculus.

p=pancreatic head.

d=duodenum.

Reference:BiblioMed Textbook-Computed Body Tomography