Table 3.

Intra- and interobserver agreement for CT imaging findings

Imaging findings	Interobserver agreement
Qualitative imaging features	Weighted kappa
Presence of ampullary mass	0.85
Growth pattern	0.77
Presence of bulging ampulla	0.81
Shape of distal CBD margin	0.84
Symmetry of distal CBD lumen	0.64
Pattern of distal CBD narrowing	0.90
Pattern of biliary dilatation	0.82
Presence of IHD dilatation	0.89
IHD dilatation extent	0.92
Presence of thickened distal CBD wall	0.80
Presence of dilated MPD	0.91
Peripancreatic lymph node enlargement	0.94
Necrosis, calcification, or cystic within lesion	0.71
Enhancement degree of lesion	0.79
Peak enhancement phase of lesion	0.78
Main vascular involvement	0.50
Presence of periampullary duodenal diverticulum	0.95
Pancreatic involvement	0.59
Quantitative imaging variables	ICC
Size of the ampullary mass (mm)	0.92
Angle of the distal CBD end (°)	0.63
Diameter of the CBD (mm)	0.79
Diameter of the MPD (mm)	0.92

ICC, intraclass correlation coefficient