A Case of Pseudocyst Originated from Ectopic Pancreas of Transverse Mesocolon Associated with Colonic Duplication

We have experienced a case of pseudocyst of transverse mesocolon in 3-year-old male child. Operative findings showed that the pseudocyst was originated from the transverse mesocolon, and was not connected to the pancreas. A colonic duplication has been also found incidentally near the pseudocyst. On microscopic examination of specimen, ectopic pancreatic tissue was noted in transverse mesocolon. We think that this pseudocyst may be originated from the ectopic pancreas of the transverse mesocolon. To our knowledge, this is the first case of pseudocyst originated from ectopic pancreas associated with colonic duplication, and the pathogenesis is discussed.