Choledochal cyst, generally considered a rare entity, has in recent years been a subject of considerable attention. The most recent review of the literature1 painstakingly summarizes the world experience up to 1959, recording 403 authentic cases, including the first description by Douglas in 1852.1,5 Therefore, it is not our purpose to review the topic again but to describe the finding at operation of multiple cystic dilatations of the intra- and extrahepatic biliary tree, and to outline the problems peculiar to the situation. Report of Case A 23-year-old man was admitted to the University Hospitals on Oct 1, 1962, following a four-day bout of fever 39.4-40.0 C (103-104 F), shaking chills, nausea, vomiting, and severe right upper quadrant pain. He was not clinically jaundiced, but his urine was dark and stools light in color. Past History. —In August, 1949, following abdominal trauma, he had severe right upper quadrant abdominal