A 31-years old presented with knee pain.

The X-rays (simulated from the CT scan) showed a distal femur lesion. This was followed by MRI and then a biopsy.

What is the most likely diagnosis?

1. Giant cell tumor

2. Chondroblastoma

3. Osteosarcoma

4. Aneurysmal bone cyst

The answer is up here.

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