Trauma imaging: renal injury: 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 · Trauma imaging: renal injury

Sample item

A stable patient with flank trauma has a CT in the portal venous phase that shows a deep renal laceration with perinephric haematoma. Which additional acquisition shows injury to the collecting system?

ADelayed excretory phase CTBNon-contrast CTCArterial phase CT onlyDRepeat portal venous phase

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

The answer and the reasoning

A. Delayed excretory phase CT

Urine leak from a collecting system injury is seen only once contrast is excreted, so a delayed phase 5 to 10 minutes after injection is added. It shows contrast extravasation in the perinephric space.

Option by option

A. Delayed excretory phase CT (correct)
Correct. Excretory phase images detect urinary extravasation.
B. Non-contrast CT
Non-contrast CT cannot show a collecting system leak.
C. Arterial phase CT only
The arterial phase shows vascular injury but not a urine leak.
D. Repeat portal venous phase
A repeat portal phase does not show excreted contrast.

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.

Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is A, Delayed excretory phase CT. Urine leak from a collecting system injury is seen only once contrast is excreted, so a delayed phase 5 to 10 minutes after injection is added.

Why is "Non-contrast CT" not the answer?

Non-contrast CT cannot show a collecting system leak.

Why is "Arterial phase CT only" not the answer?

The arterial phase shows vascular injury but not a urine leak.

Why is "Repeat portal venous phase" not the answer?

A repeat portal phase does not show excreted contrast.

What concept does this question test?

It tests Trauma imaging: renal injury in Radiology. It shows contrast extravasation in the perinephric space.

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 Trauma imaging: renal injury?

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.