Bone tumours: chondroblastoma: 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.

Try it

Orthopaedics · Bone tumours: chondroblastoma

Sample item

A 15-year-old has knee pain and a well-defined lytic epiphyseal lesion with chicken-wire calcification on histology. What is the tumour?

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

The answer and the reasoning

B. Chondroblastoma

Chondroblastoma is a benign cartilage tumour in the epiphysis of a skeletally immature patient, usually in the proximal humerus, distal femur or proximal tibia. Histology shows chondroblasts with pericellular chicken-wire calcification. Treatment is curettage and grafting.

Option by option

  • A. Giant cell tumour

    Giant cell tumours occur after physeal closure and show no chicken-wire calcification.

  • B. Chondroblastoma (correct)

    Correct. An epiphyseal lesion in an adolescent with chicken-wire calcification is chondroblastoma.

  • C. Osteosarcoma

    Osteosarcoma is metaphyseal and produces osteoid.

  • D. Enchondroma

    Enchondroma is metaphyseal or diaphyseal and in the small bones.

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.

More Orthopaedics questions

Questions about this Orthopaedics question

What is the answer to this Orthopaedics question?

The best answer is B, Chondroblastoma. Chondroblastoma is a benign cartilage tumour in the epiphysis of a skeletally immature patient, usually in the proximal humerus, distal femur or proximal tibia.

Why is "Giant cell tumour" not the answer?

Giant cell tumours occur after physeal closure and show no chicken-wire calcification.

Why is "Osteosarcoma" not the answer?

Osteosarcoma is metaphyseal and produces osteoid.

Why is "Enchondroma" not the answer?

Enchondroma is metaphyseal or diaphyseal and in the small bones.

What concept does this question test?

It tests Bone tumours: chondroblastoma in Orthopaedics. Histology shows chondroblasts with pericellular chicken-wire calcification. Treatment is curettage and grafting.

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: chondroblastoma?

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.