Endoscopic transpancreatic septotomy as a precutting technique for difficult bile duct cannulation

Table 1 Distribution of etiology in the transpancreatic septotomy and needle-knife sphincterotomy groups (case number)

Etiology	TS	NKS	Total
Benign	22	21	43
Common bile duct stones	9	8	17
Cystic dilatation of the common bile duct	1	1	2
Cholangitis	4	6	10
SOD	5	4	9
Others	3	2	5
Malignant	14	12	26
Cholangiocarcinoma	4	3	7
Pancreatic cancer	4	5	9
Duodenal papilla tumor	2	1	3
Gallbladder carcinoma	4	3	7

SOD: Sphincter of Oddi dysfunction; TS: Transpancreatic septotomy; NKS: Needle-knife sphincterotomy.