Chest and cardiac imaging: Mounier-Kuhn syndrome: 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 · Chest and cardiac imaging: Mounier-Kuhn syndrome

Sample item

A middle-aged man with recurrent chest infections has CT showing marked dilatation of the trachea and main bronchi with tracheal diverticula and corrugated walls. What is the diagnosis?

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

The answer and the reasoning

A. Tracheobronchomegaly (Mounier-Kuhn syndrome)

Mounier-Kuhn syndrome is marked dilatation of the trachea and main bronchi from atrophy of the elastic and muscular tissue, with diverticula between the cartilage rings and recurrent infection. Saber-sheath trachea is coronal narrowing of the intrathoracic trachea in COPD. Malacia is expiratory collapse, and stenosis is narrowing.

Option by option

  • A. Tracheobronchomegaly (Mounier-Kuhn syndrome) (correct)

    Correct. A markedly dilated trachea with diverticula is tracheobronchomegaly.

  • B. Tracheal stenosis

    Stenosis narrows the lumen and does not dilate it.

  • C. Saber-sheath trachea

    Saber-sheath trachea is narrowed in the coronal plane in chronic obstructive disease.

  • D. Tracheobronchomalacia

    Tracheobronchomalacia shows excessive expiratory collapse of the airway.

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, Tracheobronchomegaly (Mounier-Kuhn syndrome). Mounier-Kuhn syndrome is marked dilatation of the trachea and main bronchi from atrophy of the elastic and muscular tissue, with diverticula between the cartilage rings and recurrent infection.

Why is "Tracheal stenosis" not the answer?

Stenosis narrows the lumen and does not dilate it.

Why is "Saber-sheath trachea" not the answer?

Saber-sheath trachea is narrowed in the coronal plane in chronic obstructive disease.

Why is "Tracheobronchomalacia" not the answer?

Tracheobronchomalacia shows excessive expiratory collapse of the airway.

What concept does this question test?

It tests Chest and cardiac imaging: Mounier-Kuhn syndrome in Radiology. Saber-sheath trachea is coronal narrowing of the intrathoracic trachea in COPD. Malacia is expiratory collapse, and stenosis is narrowing.

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 Chest and cardiac imaging: Mounier-Kuhn syndrome?

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.