Abstract
A 71-year-old woman was seen in a neighborhood hospital for upper abdominal pain. She was referred to our hospital because abdominal US revealed a 3cm cystic lesion in the body of the pancreas. Laboratory data showed elevated serum levels of DUPAN2 (170U/ml), abdominal enhanced CT showed a hypovascular 3cm cystic mass with partition in the pancreatic body. On MRI, the cystic wall showed low intensity in T2WI and DWI. EUS showed a 23mm mass including 14mm cyst and a solid component in the cyst. ERP showed the dilated distal main pancreatic duct and no communication between the pancreatic cyst and the main pancreatic duct. Under a preoperative diagnosis of neuroendocrine tumor or serous pseudopapillary tumor we perfomed a laparoscopic distal pancreatectomy. Pathological diagnosis showed autoimmune pancreatitis. In this report, we present the rare case of AIP involving a true cyst.
