Table 2 MRI findings
AIP (N = 17 masses in 12 patients) | k | PDAC (N = 30) | k | P value | |
|---|---|---|---|---|---|
Number of masses | 0.824 | 1 | 0.004 | ||
1 | 8/12 | 30/30 | |||
2 | 3/12 | 0/30 | |||
3 | 1/12 | 0/30 | |||
Location | 0.904 | 0.820 | 0.343 | ||
Uncinate | 3/17 | 2/30 | |||
Head or neck | 6/17 | 16/30 | |||
Body or tail | 8/17 | 12/30 | |||
Margin | 0.876 | 1 | 0.214 | ||
Indistinct | 7/17 | 18/30 | |||
Distinct | 10/17 | 12/30 | |||
Contour | 1 | 0.776 | 0.173 | ||
Focal and diffuse enlargement | 3/17 | 4/30 | |||
Focal protrusion | 9/17 | 23/30 | |||
No bulging | 5/17 | 3/30 | |||
Shape | 0.881 | 0.839 | 0.004 | ||
Oval or round | 8/17 | 27/30 | |||
Irregular or geographical | 9/17 | 3/30 | |||
Capsule-like rim | 6/17 | 0.866 | 0/30 | 1 | 0.001 |
Internal cystic or necrotic portion | 0/17 | 1 | 10/30 | 0.923 | 0.008 |
Upstream pancreatic atrophy | 2/12 | 1 | 10/30 | 0.700 | 0.453 |
Peripancreatic infiltration | 1/12 | 1 | 12/30 | 0.789 | 0.067 |
Vascular invasion | 2/12 | 0.625 | 10/30 | 0.923 | 0.453 |
Lymphadenopathy | 2/12 | 1 | 3/30 | 1 | 0.613 |
T2WI signal intensity | 0.767 | 1 | 0.128 | ||
Isointense | 3/17 | 1/30 | |||
Hyperintense | 14/17 | 29/30 | |||
T1WI signal intensity | 0.767 | 1 | 1.000 | ||
Hypointense | 16/17 | 29/30 | |||
Isointense | 1/17 | 1/30 | |||
DWI signal intensity | 0.821 | 0.902 | 1.000 | ||
Hyperintense | 14/17 | 24/30 | |||
Isointense | 3/17 | 6/30 | |||
Signal intensity and enhancement of mass | |||||
The arterial phase | |||||
Hypointense | 15/17 | 1 | 29/30 | 1 | 0.544 |
Isointense | 2/17 | 1/30 | |||
Hyperintense | 0/17 | 0/30 | |||
Homogeneous | 4/17 | 0.821 | 2/30 | 1 | 0.170 |
Heterogeneous | 13/17 | 28/30 | |||
The pancreatic phase | |||||
Hypointense | 9/17 | 0.901 | 25/30 | 0.621 | 0.017 |
Isointense | 3/17 | 4/30 | |||
Hyperintense | 5/17 | 1/30 | |||
Homogeneous | 8/17 | 0.764 | 2/30 | 1 | 0.002 |
Heterogeneous | 9/17 | 28/30 | |||
The venous phase | |||||
Hypointense | 2/17 | 1 | 23/30 | 0.918 | < 0.001 |
Isointense | 2/17 | 4/30 | |||
Hyperintense | 13/17 | 3/30 | |||
Homogeneous | 12/17 | 0.866 | 2/30 | 1 | < 0.001 |
Heterogeneous | 5/17 | 28/30 | |||
The delayed phase | |||||
Hypointense | 1/17 | 1 | 15/30 | 0.725 | 0.001 |
Isointense | 1/17 | 4/30 | |||
Hyperintense | 15/17 | 11/30 | |||
Homogeneous | 13/17 | 0.850 | 2/30 | 1 | < 0.001 |
Heterogeneous | 4/17 | 28/30 | |||