Paediatric imaging: duplex kidney and ureterocele: 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 · Paediatric imaging: duplex kidney and ureterocele

Sample item

An IVU in a girl with recurrent urinary infection shows a drooping lily appearance of the right kidney, and a cystogram shows a rounded filling defect at the bladder base with a thin wall in the form of a cobra head. What is the diagnosis?

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

The answer and the reasoning

A. Duplex system with an ectopic ureterocele of the upper moiety

In a duplex kidney, the upper moiety ureter inserts ectopically and may end in a ureterocele that appears as a cobra head, and the upper moiety is obstructed, so the lower calyces droop like a lily (Weigert-Meyer rule).

Option by option

  • A. Duplex system with an ectopic ureterocele of the upper moiety (correct)

    Correct. A drooping lily kidney with a cobra head ureterocele fits a duplex system.

  • B. Bladder carcinoma

    A carcinoma would be irregular and thick walled.

  • C. Posterior urethral valves

    Valves occur in boys and dilate the posterior urethra.

  • D. Bladder diverticulum

    A diverticulum fills with contrast as an outpouching.

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, Duplex system with an ectopic ureterocele of the upper moiety. In a duplex kidney, the upper moiety ureter inserts ectopically and may end in a ureterocele that appears as a cobra head, and the upper moiety is obstructed, so the lower calyces droop like a lily (Weigert-Meyer rule).

Why is "Bladder carcinoma" not the answer?

A carcinoma would be irregular and thick walled.

Why is "Posterior urethral valves" not the answer?

Valves occur in boys and dilate the posterior urethra.

Why is "Bladder diverticulum" not the answer?

A diverticulum fills with contrast as an outpouching.

What concept does this question test?

It tests Paediatric imaging: duplex kidney and ureterocele in Radiology. The correct option holds because: Correct. A drooping lily kidney with a cobra head ureterocele fits a duplex system.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. 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 Paediatric imaging: duplex kidney and ureterocele?

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.