Table 3.
Comparison of MR imaging Characteristics between Type 1 AIP Patients with and without PaT
| AIP (n = 19) | AIP + PaC (n = 1) | P Value | |
|---|---|---|---|
| Pancreatic parenchyma | |||
| Enlargement pattern | 0.250 | ||
| Diffuse | 15 (79%) | 0 (0%) | |
| Focal | 4 (21%) | 1 (100%) | |
| Presence of atrophy | 2 (11%) | 1 (100%) | 0.150 |
| Signal intensity on T1WI | |||
| Hypointense | 16 (84%) | 1 (100%) | 0.911 |
| Isointense | 2 (11%) | 0 (0%) | |
| Hyperintense | 1 (5%) | 0 (0%) | |
| Presence of heterogeneity | 5 (26%) | 0 (0%) | 1.000 |
| Signal intensity on T2WI | |||
| Hypointense | 0 (0%) | 0 (0%) | 0.452 |
| Isointense | 7 (37%) | 0 (0%) | |
| Hyperintense | 12 (63%) | 1 (100%) | |
| Presence of heterogeneity | 6 (31%) | 1 (100%) | 0.300 |
| Signal intensity on pancreatic phase | |||
| Hypointense | 13 (69%) | 1 (100%) | 0.502 |
| Isointense | 6 (31%) | 0 (0%) | |
| Hyperintense | 0 (0%) | 0 (0%) | |
| Presence of heterogeneity | 12 (63%) | 1 (100%) | 1.000 |
| Signal intensity on portal venous phase | |||
| Hypointense | 1 (5%) | 0 (0%) | 0.798 |
| Isointense | 5 (26%) | 0 (100%) | |
| Hyperintense | 13 (69%) | 1 (0%) | |
| Presence of heterogeneity | 6 (31%) | 1 (100%) | 0.350 |
| Signal intensity on delayed venous phase | |||
| Hypointense | 3 (16%) | 0 (0%) | 0.753 |
| Isointense | 12 (63%) | 1 (100%) | |
| Hyperintense | 4 (21%) | 0 (0%) | |
| Presence of heterogeneity | 5 (26%) | 1 (100%) | 0.300 |
| Presence of rim enhancement | 0 (0%) | 1 (100%) | 0.050 |
| Main pancreatic duct | |||
| Presence of dilatation | 3 (16%) | 0 (0%) | 1.000 |
| Presence of cutoff | 6 (31%) | 1 (100%) | 0.350 |
| Peripancreatic structures | |||
| Presence of halo sign | 1 (5%) | 0 (0%) | 1.000 |
| Presence of stranding | 0 (0%) | 0 (0%) | 1.000 |
| Presence of ascites | 0 (0%) | 0 (0%) | 1.000 |
| Presence of vessel stricture | 13 (69%) | 1 (100%) | 1.000 |
Abbreviations: AIP autoimmune pancreatitis, PaT pancreatic tumor
Data are expressed as absolute values (percentages)