Abdominal and GI imaging: choledochal cyst classification: practice question

A Radiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Radiology · Abdominal and GI imaging: choledochal cyst classification

Sample item

A child has jaundice, pain and a right upper quadrant mass. Ultrasound shows fusiform dilatation of the extrahepatic bile duct. Which Todani type is this?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. Type I

Type I, fusiform or saccular dilatation of the extrahepatic duct, accounts for most choledochal cysts. Type II is a diverticulum, type III a choledochocele and type V multiple intrahepatic cysts (Caroli disease). Cysts carry a risk of cholangitis, stones and malignancy, so excision is advised.

Option by option

  • A. Type I (correct)

    Correct. Fusiform extrahepatic duct dilatation is type I, the commonest type.

  • B. Type II

    Type II is a saccular diverticulum arising from the duct wall.

  • C. Type III

    Type III is a choledochocele, dilatation of the intraduodenal part of the common bile duct.

  • D. Type V

    Type V is multiple intrahepatic ductal dilatations, which is Caroli disease.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is A, Type I. Type I, fusiform or saccular dilatation of the extrahepatic duct, accounts for most choledochal cysts.

Why is "Type II" not the answer?

Type II is a saccular diverticulum arising from the duct wall.

Why is "Type III" not the answer?

Type III is a choledochocele, dilatation of the intraduodenal part of the common bile duct.

Why is "Type V" not the answer?

Type V is multiple intrahepatic ductal dilatations, which is Caroli disease.

What concept does this question test?

It tests Abdominal and GI imaging: choledochal cyst classification in Radiology. Type II is a diverticulum, type III a choledochocele and type V multiple intrahepatic cysts (Caroli disease). Cysts carry a risk of cholangitis, stones and malignancy, so excision is advised.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Abdominal and GI imaging: choledochal cyst classification?

Learn signs with the image, and the disease they point to. Then use the flashcards and the other Radiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.