Direct cholangiography: its diagnostic and therapeutic role.

In the management of biliary tract disorders, direct cholangiography should be chosen over ultrasonic examination if the bile ducts are thought to be obstructed. Contrast medium can be introduced into the bile ducts either percutaneously or retrogradely via the ampulla of Vater, the choice of technique often depending on the clinical situation. Direct access to the biliary tree for diagnostic purposes has also led to advances in the treatment of mechanical disorders of the ducts.