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Autoimmune pancreatitis (AIP) is a unique form of chronic pancreatitis, and has a favourable response to corticosteroid treatment (CST). Little is known, however, about the long-term outcome of AIP. This study aimed to document the prognosis without and with CST, and to examine the indication for CST.

The prognosis and clinical features of 23 patients without CST and 19 patients treated with CST from onset were investigated. In addition, factors concerning the late occurrence of unfavourable events related to AIP were examined.

The patients without CST were 19 men and four women, with an average age of 66 years. After an average observation period of 25 months, 16 patients (70%) developed unfavourable events including obstructive jaundice as a result of distal bile duct stenosis in four, growing pseudocyst in one, sclerogenic changes of extrapancreatic bile duct in …