A 64-year-old man with asymptomatic severe ICA stenosis was treated by conventional CAS with Angioguard XP filter wire system. Follow-up angiography was performed six months later, to demonstrate severe localized stenosis in the part where the filter was deployed. Following angiography, stent-assisted angioplasty was performed successfully. We report a rare case of carotid artery stenosis induced by filter wire protection after CAS.