The authors describe a case of pseudoaneurysm of the anterior tibial artery after ankle arthroscopy that was undiagnosed for more then 10 weeks. The pseudoaneurysm was resected and postoperative recovery was uneventful. Anterior tibial artery pseudoaneurysm is a rare complication of ankle arthroscopy and should be considered when a patient presents with a local swelling of the anterolateral ankle joint.