長久以來， 免疫性胰臟炎相對難以診斷， 尤其是局部性免疫性胰臟炎(focal type autoimmune pancreatitis)與胰臟腫瘤的鑑別有一定的難度。因此有不少病例是在開刀之後才 確診。雖然日本、韓國以及歐美已經確立各自的診斷準則，在台灣的診斷率卻不高。探其原 因，一方面可能是因為臨床醫師及放射科醫師在見到胰臟局部性病灶時有時未將本疾病納入 鑑別診斷，另一方面可能是因為內視鏡超音波下導引下抽吸術及內視鏡超音波導引下切片術 尚未普及，導致本疾病的診斷率偏低。本研究旨在分析本院確診之病例，以供臨床醫師在診 斷及治療此疾病時參考。

Autoimmune pancreatitis (AIP) is a relatively rare disease and difficult to diagnose in some cases. Several subtypes of autoimmune pancreatitis were mentioned in these years. Among them, focal type autoimmune pancreatitis can mimic pancreatic neoplasm, and this kind of autoimmune pancreatitis may lead to diagnostic dilemma.However, the diagnostic rate of AIP in Taiwan is not satisfactory. The low diagnostic rate in Taiwan may result from the overlook of this disease. Whenthe clinician and the radiologist encounter a mass-like lesion in the pancreas ,and may related to the poor accessibility of EUS-FNA in Taiwan. The study will focus on the characteristics of autoimmune pancreatitis in a medical center of Taiwan, and provide some experience about diagnosis and prognosis of autoimmune pancreatitis.