Imaging Features of Autoimmune Pancreatitis (AIP)
Parenchymal changes suggestive of AIP:
1) Diffuse (AIP I) or (multi-) focal (AIP2) enlargement with loss of the normal multilobulated pattern ('sausage-like' shape)
2) Altered imaging characteristics
3) Cut-tail sign- rectangular shape of the tail
4) Thin peripancreatic oedematous rim or progressively enhancing true capsule.
Ductal changes suggestive of AIP:
1) Long-segment (i.e. ≥1/3 of the length) or multifocal main pancreatic duct (MPD) involvement (narrowing or vanishing) without upstream dilatation or other signs of obstructive pancreatitis
2) Skip lesions, i.e. ≥2 involved MPD-segments separated by a normal MPD-segment.
3) 'Duct-penetrating' (i.e. visible MPD- and/or common bile duct (CBD)-Iumen) and 'icicle' (i.e. a progressive decrease of MPD-diameter) signs within an enlarged parenchymal area.
Dr. Katarzyna Monika Pawlak @KM_Pawlak
#Autoimmune #Pancreatitis #AIP #diagnosis #radiology #gastroenterology
