Table 3: Radiologic findings.

Group A Group B value

US
 Normal 3 7 0.083
 Dilatation 4 12
 Tumor 0 15
CT
 Normal 6 6 0.003
 Dilatation 3 9
 Tumor 0 20
ERCP
 Normality 2 4 0.597
 Abnormality 7 28
IDUS
 Normality 0 1 1.000
 Tumor 8 29