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

Table 3 Results of peroral cholangioscopy n (%)

Characteristics	n = 22
Mean procedure time (min)	8.2 (range, 5-18)
The endoscope reached
Hilum or IHD	8 (36.4)
CBD and the hilum was seen	10 (45.5)
Distal CBD and the hilum was not seen	4 (18.2)
Residual stones on the POC
No. of patients	5 (22.7)
No. of residual stones (one/three/multiple)	3/1/1
Maximum diameter of stones (range, mm)	2-5

IHD: Intrahepatic duct; CBD: Common bile duct; POC: Peroral cholangioscopy