Pseudocysts May Be Seen in Immunoglobulin G4–Associated Autoimmune Pancreatitis

To the Editor.—We wish to comment on the presence of pseudocyst formation referred to by Deshpande et al1 in their comprehensive review of autoimmune pancreatitis (AIP) in the September 2005 issue of Archives of Pathology & Laboratory Medicine. Although the authors mention that pseudocyst formation has been described from a center in Japan,2 other recent publications suggest that pseudocysts do not occur in AIP.3We recently had a case of a...