Radiotherapy and nuclear medicine basics: Manchester point B: 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 · Radiotherapy and nuclear medicine basics: Manchester point B

Sample item

In the Manchester system of brachytherapy for cervical cancer, point B lies 5 cm lateral to the midline at the level of point A. What does the dose at point B approximate?

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

The answer and the reasoning

A. Dose to the obturator pelvic nodes

Point B is on the pelvic sidewall and approximates the dose to the obturator lymph nodes, whereas point A relates to the paracervical triangle. Bladder and rectal doses are recorded separately at reference points.

Option by option

  • A. Dose to the obturator pelvic nodes (correct)

    Correct. Point B represents the dose at the pelvic sidewall, equivalent to the obturator nodes.

  • B. Dose to the rectum

    Rectal dose is measured at a separate reference point on the posterior vaginal wall.

  • C. Dose to the bladder neck

    Bladder dose is recorded at a reference point on the Foley balloon.

  • D. Dose to the para-aortic nodes

    The para-aortic nodes are far above the brachytherapy field and not represented by point B.

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, Dose to the obturator pelvic nodes. Point B is on the pelvic sidewall and approximates the dose to the obturator lymph nodes, whereas point A relates to the paracervical triangle.

Why is "Dose to the rectum" not the answer?

Rectal dose is measured at a separate reference point on the posterior vaginal wall.

Why is "Dose to the bladder neck" not the answer?

Bladder dose is recorded at a reference point on the Foley balloon.

Why is "Dose to the para-aortic nodes" not the answer?

The para-aortic nodes are far above the brachytherapy field and not represented by point B.

What concept does this question test?

It tests Radiotherapy and nuclear medicine basics: Manchester point B in Radiology. Bladder and rectal doses are recorded separately at reference points.

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 Radiotherapy and nuclear medicine basics: Manchester point B?

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.