Nose and paranasal sinuses: Draf classification: 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 · Nose and paranasal sinuses: Draf classification

Sample item

A patient with recurrent frontal mucocele after multiple surgeries undergoes a procedure in which the floor of both frontal sinuses and the intersinus septum are removed to create a common drainage opening. Which Draf type is it?

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

The answer and the reasoning

B. Draf III (modified endoscopic Lothrop)

Draf I is anterior ethmoidectomy with clearing of the frontal recess. Draf IIa removes the frontal sinus floor between the lamina papyracea and the middle turbinate, and IIb extends this to the nasal septum. Draf III removes the frontal sinus floor bilaterally with the upper septum and intersinus septum.

Option by option

  • A. Draf I

    Draf I only clears the recess.

  • B. Draf III (modified endoscopic Lothrop) (correct)

    Correct. Bilateral floor and septum removal is Draf III.

  • C. Draf IIb

    Draf IIb extends to the septum on one side only.

  • D. Draf IIa

    Draf IIa widens the opening between the lamina papyracea and middle turbinate.

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 B, Draf III (modified endoscopic Lothrop). Draf I is anterior ethmoidectomy with clearing of the frontal recess.

Why is "Draf I" not the answer?

Draf I only clears the recess.

Why is "Draf IIb" not the answer?

Draf IIb extends to the septum on one side only.

Why is "Draf IIa" not the answer?

Draf IIa widens the opening between the lamina papyracea and middle turbinate.

What concept does this question test?

It tests Nose and paranasal sinuses: Draf classification in ENT. Draf IIa removes the frontal sinus floor between the lamina papyracea and the middle turbinate, and IIb extends this to the nasal septum. Draf III removes the frontal sinus floor bilaterally with the upper septum and intersinus septum.

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 Nose and paranasal sinuses: Draf classification?

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.