Transient involuntary movement of the leg (monoballismus) during cerebral angiography

Transient involuntary movement of the leg developed during diagnostic or therapeutic angiography in five patients. The movement was jerky, brisk flexion/extension of the hip and knee joints on the side contralateral to acute ischemia. This movement may occur as a result of thromboembolic cerebral ischemia or as an ischemic complication of angiography.