Abstract
We report a case of autoimmune pancreatitis localized on the pancreatic tail. A 68-year-old man was seen for upper abdominal pain and hospitalized. CT showed swelling of the pancreatic tail, cystic tumor, unevenness enhance of the spleen, and hyper vascular tumor at the pancreatic body. Serum IgG4 level was high. ERCP showed localized narrowing of the main pancreatic duct at the pancreatic tail. Cytologically, the pancreatic juice was false positive for malignant cells. Unable to rule out the pancreatic cancer, we conducted pancreatectomy of the body and tail and splenectomy. Pathological findings showed fibrosis with infiltration of plasma cells, the obliteration of a vein branch and IgG4 positive on immunohistochemical examination in the pancreas tail. The diagnosis was autoimmune pancreatitis, the adjacent cyst was a pseudocyst and the hypervascular tumor was islet cell tumor.
