Presentation
Persistent ankle pain and swelling post ankle arthroscopy.
Patient Data
A well-circumscribed oval lesion with a pseudocapsule is located anterior to the ankle joint. Centrally the lesion is low signal with a peripheral high signal rim and low signal pseudocapsule. Near homogeneous post contrast enhancement. Pulsation artifact is present. No ankle joint effusion. Degenerative change of the anterior ankle joint.
Aneurysm arising from the distal aspect of the anterior tibial artery, at the level of the ankle joint.
Case Discussion
Anterior tibial artery and less commonly dorsalis pedis false aneurysms are rare but reported complications of ankle arthroscopy. The key to diagnosis in this case is recognizing the pulsation (phase-encoded motion) artifact, which indicates this is vascular in origin.
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