Stationary waves are a rare and inconsistent angiographic finding that has been attributed to various causes, including angiographic artifact. We present 2 cases of patients with arterial occlusion in whom sonographic examination revealed a correlate of stationary waves that was present on angiography. This report is, to our knowledge, the first to document the phenomenon of stationary waves using an imaging modality other than angiography. If the sonographic findings presented here are accepted as a correlate of stationary waves, the phenomenon of stationary waves can no longer be considered a specific angiographic finding, and theories attributing the phenomenon to an angiographic artifact must be rejected.