Oral pathology: cysts and odontogenic tumours: ameloblastic fibroma: practice question

A Dentistry 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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Dentistry · Oral pathology: cysts and odontogenic tumours: ameloblastic fibroma

Sample item

A 10-year-old has a well-defined radiolucency in the posterior mandible. Histology shows strands and islands of epithelium resembling dental lamina in a cellular, primitive mesenchyme resembling dental papilla, with no enamel or dentine. What is the diagnosis?

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

The answer and the reasoning

C. Ameloblastic fibroma

Ameloblastic fibroma is a mixed tumour with both epithelial and mesenchymal components that occurs mainly in children and young adults in the posterior mandible. It lacks hard tissue and is treated with conservative excision, with follow-up for recurrence.

Option by option

  • A. Central odontogenic fibroma

    Central odontogenic fibroma is mainly fibrous tissue with scattered epithelial islands.

  • B. Odontogenic myxoma

    Odontogenic myxoma is mostly myxoid stroma with a few odontogenic epithelial rests.

  • C. Ameloblastic fibroma (correct)

    Correct. Both components without enamel or dentine point to ameloblastic fibroma.

  • D. Ameloblastic fibro-odontoma

    Ameloblastic fibro-odontoma has the same pattern plus enamel and dentine.

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 Dentistry question

What is the answer to this Dentistry question?

The best answer is C, Ameloblastic fibroma. Ameloblastic fibroma is a mixed tumour with both epithelial and mesenchymal components that occurs mainly in children and young adults in the posterior mandible.

Why is "Central odontogenic fibroma" not the answer?

Central odontogenic fibroma is mainly fibrous tissue with scattered epithelial islands.

Why is "Odontogenic myxoma" not the answer?

Odontogenic myxoma is mostly myxoid stroma with a few odontogenic epithelial rests.

Why is "Ameloblastic fibro-odontoma" not the answer?

Ameloblastic fibro-odontoma has the same pattern plus enamel and dentine.

What concept does this question test?

It tests Oral pathology: cysts and odontogenic tumours: ameloblastic fibroma in Dentistry. It lacks hard tissue and is treated with conservative excision, with follow-up for recurrence.

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 Oral pathology: cysts and odontogenic tumours: ameloblastic fibroma?

Learn the dental formula, eruption ages and tooth structure once, as tables. Then use the flashcards and the other Dentistry 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.