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-Choledochal cyst involving common bile duct (type IA). A, Percutaneous transhepatic cholangiogram shows extrahepatic location of cyst. Gallbladder (arrow) and cystic ducts are proximal to cyst. Common duct (arrowhead) distal to cyst is small. B, Enhanced CT scan shows low-density cyst (arrow) within pancreatic head. 

-Choledochal cyst involving common bile duct (type IA). A, Percutaneous transhepatic cholangiogram shows extrahepatic location of cyst. Gallbladder (arrow) and cystic ducts are proximal to cyst. Common duct (arrowhead) distal to cyst is small. B, Enhanced CT scan shows low-density cyst (arrow) within pancreatic head. 

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A classification scheme for choledochal cysts is outlined and their appearance on cholangiograms is illustrated. Choledochal cysts are uncommon anomalies of the biliary system and are probably congenital in origin. They are manifested by cystic dilatation of the extra- or intrahepatic biliary tree or both. The classification system described here d...

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Citations

... The adverse event rate for transhepatic cholangiography and biliary drainage can vary substantially with patient status before the procedure and diagnosis ( Table 6) (4,29,32,33,35,38,39,(60)(61)(62)(63)(64)(65)(67)(68)(69)(70)72,(90)(91)(92)(93)(94)(95)(96)(97). When 21-gauge or smaller needles are used, adverse events related to percutaneous transhepatic cholangiography have been reported to be low (17,29,34,39,(51)(52)(53). Patients with coagulopathies, cholangitis, stones, malignant obstruction, or proximal obstruction will have higher complication rates (19,61,93,94,98). ...
... Subtype IA shows saccular dilatation of the common bile duct. Subtype IB shows focal, segmental dilatation of the common bile duct.Subtype IC has fusi-form dilatation of the common hepatic and common bile duct[1,2].Type II cysts are a diverticulum of the CBD. TypeIII cysts are also referred to as choledochoceles, which show dilatation of the intra duodenal portion of the CBD. ...
... The Todani classification lists 5 types of CC: type 1, a pseudocystic dilatation of the extrahepatic bile duct (type 1A: fusiform, sac-like dilatation of the common bile duct; type 1-B: a diverticular dilatation of the common bile duct); type 2, a true cyst of the bile duct (lateral); type 3, a dilatation of the distal, intramural portion of the common bile duct (choledochocele); type 4, dilatation of both the extrahepatic and intrahepatic bile ducts; type 5, saccular dilatation(s) of the intrahepatic bile ducts. The overall incidence is very low with approximately one-third of reported cases been reported in Japanese population [2]. CC type 1 is the most commonly clinical presentation (70-90%), and results in most cases from a malformation of the common junction between the bile duct and the pancreatic duct (at the level of the duodenal wall where they join to form a (usually very short) common channel) [1]. ...
... Maternal medical and family histories were unremarkable. US examination was performed through standard Aloka (Aloka Co., Ltd, Tokyo, Japan) equipped with a curved linear array trans-abdominal transducer (2)(3)(4)(5) as well as with a transvaginal 4-8 MHz probe. ...
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... La classification d´Alonso-lej, la plus souvent citée, date de 1959 et distingue 4 types [3]. Plus tard, Todani a proposé une classification modifiée, actuellement plus largement employée car tient compte de l´état des voies biliaires intra-hépatiques [4,5] (Figure 6). Cette classification de est utile pour l´analyse de la pathophysiologie et de la détermination de la stratégie thérapeutique [6]. ...
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... • Type V cysts, otherwise known as Caroli Disease, are characterized by intrahepatic biliary dilation, without extra hepatic involvement. [1,7,9,10] This case presented with type-IIIa disease. ...
... As mentioned previously, patients typically present with triad of abdominal pain, jaundice, and palpable abdominal mass. [1,4,6,7,9] However, these are seen in about 40% of cases. [6] This is partially responsible for delay in the diagnosis, as seen in this case. ...
... This is a rare complication of long-standing choledochal cyst. [9] Furthermore, surgery in the presence of portal hypertension is difficult due to the vascular collaterals in the region of the porta hepatis and is associated with significant morbidity and mortality. [9] The presence of complications contributes to significant morbidity and mortality, and to a large extent determines the modality of treatment in addition to other factors. ...
... The prevalence is of 1 in 13,000 hospital admissions. 1 Prenatal diagnosis of fetal choledochal cysts has become less rare with the improvement of the ultrasound (US) equipment as well as the increased use of routine fetal anomaly scan. Prenatal diagnosis of choledochal cysts is essential since this can lead to earlier surgical repair resulting in less complications. 2 ...
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... Choledochal cysts are rare anomalies, characterized by cystic or fusiform dilatation of the intrahepatic and/or extrahepatic biliary tracts. These cysts have been classified into five major types [9] . Cystic dilatation of the common bile duct (type 1 choledochal cyst) comprises 80-90% of the cysts. ...
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Choledochal cysts are congenital anomalies of the biliary ducts, characterized by cystic dilatation of the ducts. Prenatal diagnosis of this anomaly using ultrasonography (US) has been well documented. Magnetic resonance imaging (MRI) has recently become an important complement to US in prenatal diagnosis of fetal anomalies. We herein report a patient in whom at 24 wk’ gestation US suggested a right upper quadrant abdominal cyst and in whom at 26 wk’ gestation MRI more clearly delineated the cyst and its surrounding structures and suggested a choledochal cyst, which was confirmed at postnatal surgery and histopathology. Keywords: Choledochal cyst, Prenatal diagnosis, MRI Citation: Wong AMC, Cheung YC, Liu YH, Ng KK, Chan SC, Ng SH. Prenatal diagnosis of choledochal cyst using magnetic resonance imaging: A case report. World J Gastroenterol 2005; 11(32): 5082-5083