FRCR 2A Question of Day #2

Question

An 18-year-old male presents with ongoing pain in the distal femur over the past several weeks.

A radiograph demonstrates an expansile lucent bone lesion within the distal femur. A subsequent MRI demonstrates multiple cysts with a fluid-fluid level without cortical breach.

Which of the following is the most likely cause?

Options

• Aneurysmal bone cyst
• Giant cell tumour
• Simple bone cyst
• Telangiectatic osteosarcoma Fibrous dysplasia

Answer

Aneurysmal bone cyst

Explanation:

An aneurysmal bone cyst (ABC) is a benign, expansile, osteolytic lesion filled with blood-filled cystic spaces. The key imaging feature is the presence of multiple cystic areas with fluid-fluid l...