Aneurysmal bone cyst (ABC)

Case contributed by Alexandra Stanislavsky
Diagnosis almost certain
x-ray
Frontal
Lateral
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Initial radiographs demonstrate a lucent expansile lesion involving the right neck of fibula.

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

mri
Axial
T1
This study is a stack
Axial T2
fat sat
Coronal T2
fat sat
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Expansile lesion of the proximal fibular that is T2 hyperintense with numerous fluid-fluid levels. Surrounding soft tissue inflammation. 

ct
This study is a stack
Axial bone
window
This study is a stack
3D VRT bone
window
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CT demonstrates lytic lesion in the proximal fibular that is expansile with cortical thinning. 

x-ray
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Following curettage and bone chip packing.

Case Discussion

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

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