Location | |
Type I | Duodenal obstruction proximal to the major papilla |
Type II | Duodenal obstruction involving the major papilla |
Type III | Duodenal obstruction distal to the major papilla |
Timing | |
Group 1 | Biliary obstruction occurring before the onset of duodenal obstruction |
Group 2 | Biliary and duodenal obstruction occurring simultaneously |
Group 3 | Biliary obstruction occurring after the onset of duodenal obstruction |