False aneurysms following inversion trauma of the ankle are very uncommon. We present a case of a 40-year-old male referred to our radiology department with persisting and painful swelling of the ankle following an inversion trauma. An MRI scan was performed that showed a false aneurysm originating from a distal anterior tibial artery side branch; the lateral malleolar artery. The false aneurysm was confirmed with ultrasound and successfully treated with ultrasoundguided thrombin injection. The patient made an uneventful recovery.