Presentation
Longstanding right leg pain and limping.
Patient Data
Expansile lucent lesion in the metadiaphysis of the fibula; it shows a narrow zone of transition and there is no displaced fracture or periosteal reaction. The cortex is extremely thinned and displaced.
Distal fibular metadiaphyseal well-defined expansile multi-septated bone lesion with narrow zone of transition and minimal surrounding soft tissue enhancement, showing internal fluid-fluid levels. No evidence of bone destruction, cortical breach or soft tissue component.
Taking into consideration that aneurysmal bone cyst (ABC) is a "do not touch lesion," no intervention was undertaken by the orthopedic team apart from analgesia.
Case Discussion
Fluid-fluid levels are characteristic of an aneurysmal bone cyst, although they are not pathognomonic.
T1 hyperintensity within these fluid-fluid levels indicates the presence of blood products.
A fibular aneurysmal bone cyst is a benign, blood-filled cavity that typically arises in the fibula, leading to localized swelling and potential pain. It commonly presents in children and adolescents and may necessitate surgical intervention if symptomatic or exhibiting growth.
Unfortunately, the patient did not return to our center for follow-up.
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