Skin tumours: dermoscopy of seborrhoeic keratosis: 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: dermoscopy of seborrhoeic keratosis

Sample item

Dermoscopy of a brown stuck-on plaque on the back shows milia-like cysts, comedo-like openings and brain-like fissures and ridges. What is the diagnosis?

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

The answer and the reasoning

B. Seborrhoeic keratosis

Milia-like cysts, comedo-like openings and a fissured, ridged surface are characteristic dermoscopic features of seborrhoeic keratosis. It is a benign epidermal tumour of older adults, and diagnosis is usually clinical.

Option by option

  • A. Dermatofibroma

    Dermatofibroma shows a central white patch with a delicate peripheral pigment network.

  • B. Seborrhoeic keratosis (correct)

    Correct. These dermoscopic features are classic for seborrhoeic keratosis.

  • C. Superficial basal cell carcinoma

    Superficial basal cell carcinoma shows shiny white areas, fine telangiectasia and leaf-like areas.

  • D. Dysplastic naevus

    A dysplastic naevus shows an irregular pigment network without milia-like cysts.

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 B, Seborrhoeic keratosis. Milia-like cysts, comedo-like openings and a fissured, ridged surface are characteristic dermoscopic features of seborrhoeic keratosis.

Why is "Dermatofibroma" not the answer?

Dermatofibroma shows a central white patch with a delicate peripheral pigment network.

Why is "Superficial basal cell carcinoma" not the answer?

Superficial basal cell carcinoma shows shiny white areas, fine telangiectasia and leaf-like areas.

Why is "Dysplastic naevus" not the answer?

A dysplastic naevus shows an irregular pigment network without milia-like cysts.

What concept does this question test?

It tests Skin tumours: dermoscopy of seborrhoeic keratosis in Dermatology. It is a benign epidermal tumour of older adults, and diagnosis is usually clinical.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. 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: dermoscopy of seborrhoeic keratosis?

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.