Endoscopic ultrasound guided biliary drainage in surgically altered anatomy: A comprehensive review of various approaches

Table 1 shows surgically altered anatomy, approach to biliary tree and endoscopic ultrasound guided biliary drainage procedures

No	Surgically altered anatomy	Approach to biliary tree	EUS biliary drainage procedure
1	Sleeve gastrectomy	From duodenum bile duct can be punctured; From Segment 2 or 3 ducts	Transmural: EUS CD, Rendezvous procedure; Transmural: EUS HGS, Antegrade drainage procedure
2	Billroth-I gastrectomy	From duodenum bile duct can be punctured; From segment 2 or 3 ducts	Transmural: EUS CD, Rendezvous procedure; Transmural: EUS HGS, Antegrade drainage procedure
3	Billroth-II gastrectomy	From segment 2 or 3 ducts	Transmural: EUS HGS, Antegrade drainage procedure
4	Roux-en-Y gastric bypass	From segment 2 or 3 ducts	Transmural: EUS HGS, Antegrade drainage procedure; EDGE procedure
5	Whipple’s procedure	From segment 2 or 3 ducts	Transmural: EUS HGS, Antegrade drainage procedure
6	Roux-en-Y hepatojejunostomy	From segment 2 or 3 ducts	Transmural: EUS HGS, Antegrade drainage procedure

CD: Choledochduodenostomy; HGS: Hepaticogastrostomy; EUS: Endoscopic ultrasound.