Bone tumours: osteofibrous dysplasia: practice question

A Orthopaedics 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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Orthopaedics · Bone tumours: osteofibrous dysplasia

Sample item

A 4-year-old has painless anterior bowing of the tibia without a fracture. Radiographs show a well-defined, multiloculated lucent lesion within the anterior cortex of the mid-tibial diaphysis with sclerotic margins. Which lesion is this?

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

The answer and the reasoning

C. Osteofibrous dysplasia

Osteofibrous dysplasia (ossifying fibroma of long bones) is a benign cortical lesion of the anterior tibia in young children and often stabilises or regresses at puberty. It is managed by observation, and its relation to adamantinoma is why long-term follow-up and biopsy for atypical lesions are advised.

Option by option

  • A. Non-ossifying fibroma

    A non-ossifying fibroma is an eccentric metaphyseal lesion.

  • B. Adamantinoma

    Adamantinoma is a rare malignant tumour of adolescents and adults in the same location.

  • C. Osteofibrous dysplasia (correct)

    Correct. This is an intracortical lesion of the anterior tibia in early childhood.

  • D. Simple bone cyst

    A simple bone cyst is a central metaphyseal lesion, not an anterior cortical one.

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 Orthopaedics question

What is the answer to this Orthopaedics question?

The best answer is C, Osteofibrous dysplasia. Osteofibrous dysplasia (ossifying fibroma of long bones) is a benign cortical lesion of the anterior tibia in young children and often stabilises or regresses at puberty.

Why is "Non-ossifying fibroma" not the answer?

A non-ossifying fibroma is an eccentric metaphyseal lesion.

Why is "Adamantinoma" not the answer?

Adamantinoma is a rare malignant tumour of adolescents and adults in the same location.

Why is "Simple bone cyst" not the answer?

A simple bone cyst is a central metaphyseal lesion, not an anterior cortical one.

What concept does this question test?

It tests Bone tumours: osteofibrous dysplasia in Orthopaedics. It is managed by observation, and its relation to adamantinoma is why long-term follow-up and biopsy for atypical lesions are advised.

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 Bone tumours: osteofibrous dysplasia?

Pair each fracture with its classic complication and nerve injured. Then use the flashcards and the other Orthopaedics 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.