:*Any contrast outside the drain or biliary tract, including leakage along the outside of the drain.
:*Any visible stones in the gallbladder or bile duct
===If unable to infuse any contrast===
*Check if there are any kinks of the catheter, visually outside the skin, and/or by radiography inside. Internal kinks can possibly be overcome by switching patient position such as changing from lying down to standing.
===Drain malposition===