American Board of Surgery Qualifying Exam (ABS QE) Practice Test

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A Type 2 choledochal cyst is defined as what?

Low CBD cyst
Outpouching
Both intra and extrahepatic
Intrahepatic only

The correct answer is: Outpouching

A Type 2 choledochal cyst is characterized as an outpouching of the common bile duct (CBD). This type of cyst is distinct from other classifications of choledochal cysts, which may present with different characteristics in terms of location and morphology. Type 2 cysts specifically involve an outpouching or diverticulum formation from the ductal structure, representing a localized dilation that can cause complications such as obstruction or infection. Understanding the nature of this outpouching helps in differentiating it from other types of choledochal cysts, which may present as cysts in the intrahepatic bile ducts or as other anatomical variations. The other options describe different aspects or locations of biliary pathology. For example, low CBD cysts refer to cysts located at the distal end of the bile duct, while intrahepatic only options suggest cyst formations strictly within the liver's duct system, which does not pertain to the primary definition of a Type 2 choledochal cyst. The presence of both intra and extrahepatic options also does not align with the specific characteristics of a Type 2 cyst, which focuses on the outpouching feature.