Pharynx: skull base spread of nasopharyngeal carcinoma: practice question

A ENT 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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ENT · Pharynx: skull base spread of nasopharyngeal carcinoma

Sample item

A man with nasopharyngeal carcinoma develops diplopia and facial numbness. MRI shows tumour in the cavernous sinus. Which natural skull base route is most commonly used for this extension?

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

The answer and the reasoning

A. Foramen lacerum

The nasopharyngeal roof lies close to the foramen lacerum, which is covered by fibrocartilage and offers little resistance. Tumour passes through it to the cavernous sinus and middle cranial fossa, affecting cranial nerves III to VI. Other routes include the foramen ovale.

Option by option

  • A. Foramen lacerum (correct)

    Correct. Foramen lacerum provides easy access to the cavernous sinus.

  • B. Incisive foramen

    The incisive foramen is in the hard palate.

  • C. Foramen magnum

    The foramen magnum lies behind the brainstem.

  • D. Stylomastoid foramen

    The stylomastoid foramen transmits the facial nerve.

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 ENT question

What is the answer to this ENT question?

The best answer is A, Foramen lacerum. The nasopharyngeal roof lies close to the foramen lacerum, which is covered by fibrocartilage and offers little resistance.

Why is "Incisive foramen" not the answer?

The incisive foramen is in the hard palate.

Why is "Foramen magnum" not the answer?

The foramen magnum lies behind the brainstem.

Why is "Stylomastoid foramen" not the answer?

The stylomastoid foramen transmits the facial nerve.

What concept does this question test?

It tests Pharynx: skull base spread of nasopharyngeal carcinoma in ENT. Tumour passes through it to the cavernous sinus and middle cranial fossa, affecting cranial nerves III to VI. Other routes include the foramen ovale.

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 Pharynx: skull base spread of nasopharyngeal carcinoma?

Learn tuning fork results and audiogram patterns by sketching them. Then use the flashcards and the other ENT 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.