A 62-year-old man was admitted due to consciousness disturbance and motor aphasia. Magnetic resonance (MR) images demonstrated watershed infarctions in the territory of the left middle cerebral artery, occlusion of the left internal carotid artery, and severe stenosis of the right internal carotid artery at the neck. He was treated with a recombinant tissue plasminogen activator. One month later, angiography revealed recanalization of the left internal carotid artery with residual severe stenosis at the neck. We attempted carotid artery stenting (CAS) on the left internal carotid artery, but could not pass the guide wire through the stenosis. Therefore, we performed CAS on the right carotid artery instead. At the second day after CAS, the patient showed consciousness disturbance, right hemiparesis, and motor aphasia. MR images showed a new infarction in the left cerebral hemisphere and bilateral multifocal segmental arterial constrictions. By keeping his blood pressure at a high enough level for one week, his symptoms were relieved, and MR images showed resolution of the vessel constrictions. From this case, we can conclude that this kind of multiple segmental vasospasms after CAS require contrasting treatments to those for hyperperfusion syndrome. Interventionalists should be aware of this condition and its treatments.