Abstract
Pancreatic lymphoepithelial cyst is a rare pancreatic lesion of undetermined pathogenesis, which is a true pancreatic cyst. Castleman's disease is a rare lymphoproliferative disorder, and a mesenteric location is unusual. The simultaneous occurrence of the two diseases are rarer than metachronous ones and has not been reported to date. We present a case report of a patient with simultaneous occurrence of pancreatic lymphoepithelial cyst and duodenal mesenteric Castleman's disease.