Traumatic Subarachnoid Hemorrhage Originating from Mid-Cervical Arterial Injury.

Abstract

Subarachnoid hemorrhage (SAH) occasionally originates from extracranial arteries, and SAH caused by cervical trauma is even rarer. A 17-year-old male patient was admitted to our emergency department aftera bike accident; he was drowsy and showed left hemiparesis. Initial computed tomography (CT) of the brain showed SAH into the cervicomedullary cistern. A 4-hour follow-up brain CT revealed heavy bleeding into the basal cistern. Because CT angiography did not show any vascular injury, we performed imaging studies of the cervical spine. Magnetic resonance imaging revealed a blood clot located ventral to the C4-C5 level of the spinal cord without any flow void. The patient's condition deteriorated over time, and he was accordingly referred for surgery. Intraoperatively, a thick subarachnoid hematoma ventral to the spinal cord was observed. The hematoma was removed and hemostasis by bipolar cauterization was performed for bleeding from a small branch of the anterior spinal artery. Postoperatively, the weakness of the lower extremity improved considerably. In young adult patients with SAH of unexplained origin, we suggest that the cervical region be considered as the bleeding focus; in such cases, surgical evacuation of bleeding can save some patients.