Post-traumatic vasospasm is a well-recognized complication of head injury. However, symptomatic vasospasm rarely occurs in patients with mild head injuries. A 58-year-old female patient presented with head injury and a traumatic subarachnoid hematoma along the left lateral fi ssure, which subsequently induced symptomatic vasospasm. Magnetic resonance imaging of her brain showed acute infarction of the left middle cerebral artery. Angiography demonstrated multiple segmental narrowing of the left middle cerebral artery near the hematoma spatially in accordance with PTSV. In conclusion, early recognition of PTSV is crucial to improving neurological outcomes.