Table 5 Comparison of POCS findings between IgG4-SC and ECC based on the stricture site
| Â | Perihilar bilu duct | Distal bile duct | ||||
|---|---|---|---|---|---|---|
POCS findings | IgG4-SC (n = 9) | ECC (n = 30) | p value | IgG4-SC (n = 10a) | ECC (n = 23) | p value |
Mucosal surface (smooth: irregular) | 7: 2 | 3: 27 | <  0.001 | 10: 0 | 2: 21 | < 0.001 |
Dilated vessels (present: absent) | 8: 1 | 24: 6 | 1.000 | 3: 7 | 18: 5 | 0.016 |
 Tortuosity (present: absent) | 6: 2 | 19: 5 | 1.000 | 3: 0 | 16: 2 | 1.000 |
 Abrupt caliber alteration (present: absent) | 2: 6 | 21: 3 | 0.002 | 0: 3 | 15: 3 | 0.015 |
 Disruption (present: absent) | 1: 7 | 14: 10 | 0.041 | 0: 3 | 11: 7 | 0.090 |
Easily bleeding (present: absent) | 0: 9 | 17: 13 | 0.003 | 0: 10 | 9: 14 | 0.032 |