Detection of Stationary Waves on Duplex Ultrasound: Two Case Reports

Stationary or standing arterial waves are rare and poorly understood vascular imaging findings, most commonly visualized on conventional angiography. They have been documented on computed tomography angiography and magnetic resonance angiography, but, to date, documentation of this phenomenon using ultrasound has been exceedingly rare. We present 2 cases in which sinusoidal, wave-like undulations along the arterial wall were initially identified on duplex ultrasound, with corresponding findings later confirmed on angiographic imaging. To our knowledge, these cases represent some of the few reported instances where ultrasound served as the primary detection modality. These observations challenge the notion that stationary arterial waves are exclusive to angiographic techniques and support a potential pathophysiological basis for their occurrence.