Diagnosis of type 1 or type 2 autoimmune pancreatitis (AIP) according to the 2023 Chinese guidelines for the diagnosis and treatment of AIP or the 2011 International Consensus Diagnostic Criteria.
Imaging evidence of a focal pancreatic mass confined to a specific pancreatic segment.
Preoperative endoscopic ultrasound (EUS) examination with at least five clear images of the lesion obtained from different imaging planes.
Histopathological confirmation of AIP based on EUS-guided fine-needle aspiration/biopsy (EUS-FNA/FNB) or surgical pathology.
Complete clinical data, including demographic characteristics, serological findings, imaging results, treatment information, and follow-up records.
Written informed consent from the patient or legal representative, as applicable.
