The duodenal loop.
D001659:Biliary Tract; D001661:Biliary Tract Neoplasms; D004386:Duodenum / Q000000981:diagnostic imaging*; D006801:Humans; D007565:Jaundice; D041781:Jaundice, Obstructive / Q000175:diagnosis*; D010190:Pancreatic Neoplasms; D011859:Radiography
BILIARY TRACT/neoplasms; DUODENUM/radiography; JAUNDICE, OBSTRUCTIVE/diagnosis; PANCREAS/neoplasms