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There are 6 types of choledochal cysts, with type I being the most common (Fig. 1). A type III cyst, accounting for 1% to 5% of biliary cysts, involves dilation of the intraduodenal part of the distal common bile duct; these cysts are further subclassified into type IIIA, in which both the bile and pancreatic ducts terminate in the cyst, and type IIIB, in which an intra-ampullary or intraduodenal diverticulum is formed.
We present a case of EUS-guided diagnosis of a type IIIA choledochal cyst.
Figure 1Classification of choledochal cysts. GB: gallbladder; RHD: right hepatic duct, LHC: left hepatic duct; CHD: common hepatic duct; CBD: common bile duct; CD: cystic duct.
An 81-year-old woman with a medical history of diabetes mellitus type II, hypertension, hyperlipidemia, GERD, and irritable bowel syndrome presented to the outpatient gastroenterology clinic for symptoms of abdominal cramping and constipation. She had a history of mixed-type irritable bowel syndrome but reported worsening constipation with abdominal cramping localized to the lower abdomen. She underwent a colonoscopy that was remarkable for severe diverticulosis in the sigmoid.
An abdominal CT scan showed cystic dilation of the distal common bile duct measuring 1.7 cm and extending into the lumen of the descending duodenum (Fig. 2). The common bile duct was 9 mm, and the pancreatic duct was unremarkable. Liver function tests were unremarkable. The patient was referred for an EUS examination. A bulging of the ampullary region was noted, with papilla located inferiorly on this bulge (Fig. 3). On EUS examination, an anechoic cystic dilation of the intraduodenal segment of the bile duct was seen with normal caliber of bile duct (Fig. 4). There were no signs of endosonographic or endoscopic abnormalities in the ampulla. The proximal bile duct appeared normal. The pancreas and pancreatic duct also appeared normal.
Figure 2Coronal view of a CT scan of the abdomen and pelvis. A,Arrow showing type III choledochal cyst. B,Arrow showing type III choledochal cyst and common bile duct.
Although duodenal duplication cysts can be misdiagnosed as type III choledochal cysts, duplication cysts often appear to be multilayered with epithelial lining and muscularis proporia that are continuous with the duodenum. They often have an echogenic inner layer with a hypoechoic surrounding layer on EUS.
This was not present in this patient, thus confirming the diagnosis of type III choledochal cyst. Given the patient’s advanced age, normal liver biochemistry, and absence of clinical symptoms, no endoscopic or surgical intervention was pursued. A 6-month follow-up is planned (Video 1, available online at www.VideoGIE.org).
On duodenoscopy, a bulging of the ampullary region was noted, with papilla located inferiorly on this bulge. On EUS examination, an anechoic cystic dilation of the intraduodenal segment of the bile duct was seen with normal caliber of bile duct. There were no signs of endosonographic or endoscopic abnormalities in the ampulla. The proximal bile duct appeared normal. The pancreas and pancreatic duct appeared normal.
References
Hoilat G.J.
John S.
Choledochal cyst.
in: StatPearls [Internet]. StatPearls Publishing,
Treasure Island, FL2020
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