Colorectal: rectal cancer staging with MRI: practice question

A General Surgery 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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General Surgery · Colorectal: rectal cancer staging with MRI

Sample item

In a patient with mid-rectal cancer, which MRI finding is most important for deciding on neoadjuvant chemoradiotherapy?

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

The answer and the reasoning

B. Threatened circumferential resection margin

Pelvic MRI defines T stage, nodal status and the mesorectal fascia relationship. A tumour within 1 mm of the mesorectal fascia (threatened or involved circumferential resection margin) predicts local recurrence, so downstaging therapy is given before total mesorectal excision. Complete mesorectal excision is the oncological principle of rectal surgery.

Option by option

  • A. Mucinous histology on imaging

    Histological subtype cannot be reliably decided on MRI.

  • B. Threatened circumferential resection margin (correct)

    Correct. Margin threat drives the need for neoadjuvant treatment.

  • C. Tumour length of 2 cm

    Short length alone does not alter neoadjuvant planning.

  • D. Distance of tumour from the anal verge of 3 cm

    Distance from the anus influences sphincter preservation but not primarily the neoadjuvant decision.

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 General Surgery question

What is the answer to this General Surgery question?

The best answer is B, Threatened circumferential resection margin. Pelvic MRI defines T stage, nodal status and the mesorectal fascia relationship.

Why is "Mucinous histology on imaging" not the answer?

Histological subtype cannot be reliably decided on MRI.

Why is "Tumour length of 2 cm" not the answer?

Short length alone does not alter neoadjuvant planning.

Why is "Distance of tumour from the anal verge of 3 cm" not the answer?

Distance from the anus influences sphincter preservation but not primarily the neoadjuvant decision.

What concept does this question test?

It tests Colorectal: rectal cancer staging with MRI in General Surgery. A tumour within 1 mm of the mesorectal fascia (threatened or involved circumferential resection margin) predicts local recurrence, so downstaging therapy is given before total mesorectal excision. Complete mesorectal excision is the oncological principle of rectal surgery.

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 Colorectal: rectal cancer staging with MRI?

Learn classic signs and eponyms alongside what they diagnose. Then use the flashcards and the other General Surgery 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.