A 65-year-old man with a 6-year history of diabetes mellitus presented with left-sided sensory disorder, hemiparesis, and dysarthria. Magnetic resonance imaging (MRI) of the brain revealed multiple cerebral infarcts in the right cerebral hemisphere. Doppler ultrasonography, three-dimensional computed tomography angiography (3D-CTA), and MRI detected a 60% stenosis of the right cervical carotid artery resulting from a soft and lipid-rich plaque. The patient underwent right carotid