Skin tumours: naevus sebaceus: practice question

A Dermatology 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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Dermatology · Skin tumours: naevus sebaceus

Sample item

A teenager has a yellow-orange hairless warty plaque on the scalp present since birth that has thickened at puberty. What is the concern in later life?

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

The answer and the reasoning

A. Development of secondary tumours such as trichoblastoma and, rarely, basal cell carcinoma

Naevus sebaceus of Jadassohn is a congenital hamartoma that thickens at puberty. Secondary benign tumours, most commonly trichoblastoma, and rarely basal cell carcinoma can develop within it, and management is observation or excision. Large lesions can be part of a neurocutaneous syndrome.

Option by option

  • A. Development of secondary tumours such as trichoblastoma and, rarely, basal cell carcinoma (correct)

    Correct. Secondary adnexal tumours can arise within naevus sebaceus.

  • B. Transformation into melanoma in all patients

    Melanoma is not the usual complication.

  • C. Systemic lupus

    Lupus is not associated.

  • D. Development of lymphoma

    Lymphoma is not associated.

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 Dermatology question

What is the answer to this Dermatology question?

The best answer is A, Development of secondary tumours such as trichoblastoma and, rarely, basal cell carcinoma. Naevus sebaceus of Jadassohn is a congenital hamartoma that thickens at puberty.

Why is "Transformation into melanoma in all patients" not the answer?

Melanoma is not the usual complication.

Why is "Systemic lupus" not the answer?

Lupus is not associated.

Why is "Development of lymphoma" not the answer?

Lymphoma is not associated.

What concept does this question test?

It tests Skin tumours: naevus sebaceus in Dermatology. Secondary benign tumours, most commonly trichoblastoma, and rarely basal cell carcinoma can develop within it, and management is observation or excision. Large lesions can be part of a neurocutaneous syndrome.

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 Skin tumours: naevus sebaceus?

Learn each condition by its primary lesion, site and signature sign. Then use the flashcards and the other Dermatology 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.