Subclavian artery steal syndrome refers to the narrowing or occlusion of the proximal segment of the subclavian artery and the unnamed artery at the beginning of the vertebral artery, after which the blood flow from the contralateral vertebral artery returns to the affected vertebral artery via the basilar artery and reconstitutes the blood supply to the distal segment of the affected subclavian artery. In addition to ischemia of the affected limb, its symptoms may include vertigo, blurred vision, unstable walking, and in some cases, headache, head and occipital pain or hearing loss, for which stenting is the treatment of choice. Figure 1 The imaging shows severe stenosis distal to the opening of the left subclavian artery, with a thin thread-like pattern and only a small amount of contrast passing distally; the vertebral artery is not visualized. Figure 2 The catheter was placed into the distal part of the stenosis under the guidance of a guidewire, showing a good vascular pattern at the distal part of the stenosis and a visualization of the left vertebral artery. Figure 3 Post-stenting angiogram of the stenosis: the vessel morphology is restored, the blood flow is smooth, and the vertebral artery is well visualized. The case mainly presented with weakness of the left upper limb and dizziness after activity, and the left subclavian artery was found to be severely stenosed by ultrasound.