A choledocal cyst is a dilation of some component of the biliary tract that may include both intra- and extra-hepatic sites. They are classified into six types, all of which are relatively rare. Previously, choledochal cysts were treated with biliary-enteric bypass procedures. The current recommendation is to attempt complete excision to minimize the known risk of malignancy and the development of recurrent cholangitis or pancreatitis that may occur in patients with these cystic lesions. Two cases are discussed in which type I choledochal cysts presented. One was removed from a 31-yr-old man who presented with vague abdominal complaints the other from a 32-yr-old man who presented with pancreatitis. The epidemiology, diagnosis, surgical treatment, and risk of cancer in choledochal cysts is described.
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