Aneurysmal bone cyst of the talus

Case contributed by Dr Amro Omar


Right ankle pain

Patient Data

Age: 30 years

Within the talus, there is a well defined lesion with thin septa and fluid-fluid levels. The lesion has a narrow zone of transition. Minimal reactive marrow edema is seen around the lesion. No cortical destruction, no pathological fracture seen.

Other findings in this case include a partial tear of the anterior talofibular ligament and tibialis posterior tenosynovitis.

Case Discussion

The major differential diagnosis aneurysmal bone cyst (ABC) and telangiectatic osteosarcoma (TO).

One should watch for any hint of aggressiveness. For example, periosteal reaction, cortical breakthrough, or soft tissue mass may suggest TO. However, TO can be entirely lytic and mimic ABC.

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Case information

rID: 36944
Published: 19th May 2015
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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