Residual common bile duct stones on direct peroral cholangioscopy using ultraslim endoscope

Table 2 Results of endoscopic retrograde cholangiography n (%)

Characteristics	n = 22
CBD stones
No. of stones (one/two/three/more than three)	10/2/4/6
Mean maximum diameter (mm)	13.4 ± 5.6 (range, 5-25.4)
Mean maximum diameter of CBD (mm)	17.9 (range, 10-30)
ES and/or EPBD
ES	1 (4.5)
EPBD	13 (59.1)
ES + EPBD	6 (27.3)
None1	2 (9.1)
Mean maximum inflated diameter during EPBD2 (mm)	13.6 (range, 12-15)
Stone extraction methods
Balloon and/or basket	20 (90.9)
Mechanical lithotripter	2 (9.1)
Intact stone extraction	11 (50)

¹Endoscopic papillary balloon dilatation (EPBD) was performed during the previous endoscopic session, and the papillary orifice was adequate;

²A total of 15 cases underwent EPBD. CBD: Common bile duct; ES: Endoscopic sphincterotomy.