A 31-year-old man presented with abdominal pain and iron deficiency an
aemia due to gastrointestinal blood loss. Endoscopic retrograde cholan
giopancreatography (ERCP) revealed a choledochocele, located between t
he ampullary sphincter and the sphincters of the common bile duct and
pancreatic duct. The choledochocele was removed surgically and appeare
d to be covered with duodenal mucosa. Gastrointestinal blood loss is e
xplained by the extensive erosions found in the duodenal mucosa of the
choledochocele. Choledochoceles should be treated by radical resectio
n.