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Table 3 Comparison of MR imaging Characteristics between Type 1 AIP Patients with and without PaT

From: Pancreatic tumor in type 1 autoimmune pancreatitis: a diagnostic challenge

  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
  1. Abbreviations: AIP autoimmune pancreatitis, PaT pancreatic tumor
  2. Data are expressed as absolute values (percentages)