Misinterpreted Recurrence of Autoimmune Pancreatitis as Malignant Transformation of Branch-Duct Intraductal Papillary Mucinous Neoplasm
10.15279/kpba.2026.31.1.13
- Author:
Eun Jeong KIM
;
Chang Hyun KIM
;
Tae Seung LEE
;
Jin Ho CHOI
;
In Rae CHO
;
Sang Hyub LEE
;
Ji Kon RYU
;
Woo Hyun PAIK
- Publication Type:Case Report
- From:Korean Journal of Pancreas and Biliary Tract
2026;31(1):13-18
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
This case describes a male with a history of type 1 autoimmune pancreatitis (AIP) who had a concomitant branch-duct intraductal papillary mucinous neoplasm under long-term surveillance. During follow-up, new high-risk radiologic features developed within the pancreatic cyst, raising concern for malignant transformation and ultimately leading to surgical resection. However, final histopathologic examination revealed recurrent type 1 AIP rather than malignant progression of branch-duct intraductal papillary mucinous neoplasm, a finding that represents an uncommon and diagnostically challenging manifestation. This case suggests that when new imaging changes are observed during surveillance of pancreatic cystic lesions, clinicians should consider not only malignant transformation but also the possibility of recurrence or coexistence of underlying diseases such as AIP.
