Table 2.

Comparison of POCS findings between IgG4-SC and ECC

	IgG4-SC	ECC
POCS findings	(n = 19)	(n = 53)	P value
Mucosal surface (smooth: irregular)	17: 2	9: 44	<  0.001
Dilated vessels (present: absent)	11: 8	42: 11	0.070
Tortuosity (present: absent)	9: 2	35: 7	1.000
Abrupt caliber alteration (present: absent)	2: 9	36: 6	<  0.001
Disruption (present: absent)	1: 10	25: 17	0.005
Easily bleeding (present: absent)	0: 19	26: 27	<  0.001

POCS peroral cholangioscopy; IgG4-SC IgG4-related sclerosing cholangitis; ECC extrahepatic cholangiocarcinoma