At present, the treatment of internal carotid artery stenosis has been extensively modified, passing from endarterectomy to balloon plasty and stent placement, generating a significant reduction in surgical risk [1]. In-stent stenosis is reported in up to 30% of cases and patients generally present with a transient ischemic attack or stroke [2]. Doppler ultrasound is an excellent tool for the evaluation of this pathology, accurately monitoring the percentage of in-stent stenosis and the hemodynamic repercussion it represents. In-stent stenosis of 50% correlates with velocities of up to 225 cm/s and greater than 70% correlates with velocities of up to 350 cm/s [3].