Aneurysmal bone cyst (ABC)

Case contributed by Dr Alexandra Stanislavsky

Initial radiographs demonstrate a lucent expansile lesion involving the right neck of fibula.

Bone scan demonstrates the "doughnut sign" of aneurysmal bone cyst : peripheral uptake with a photopenic center.

Expansile lesion of the proximal fibular that is T2 hyperintense with numerous fluid-fluid levels. Surrounding soft tissue inflammation. 

CT demonstrates lytic lesion in the proximal fibular that is expansile with cortical thinning. 

Following curettage and bone chip packing.

Case Discussion

This case demonstrates the multimodality appearance of an aneurysmal bone cyst (ABC)

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