An 82-year-old woman was diagnosed with extracranial carotid artery aneurysms (ECAAs). These aneurysms were resected using the posterior cervical triangle. The patient had transient right paresis and a left cervical aneurysm, measuring a maximum diameter of 72.2 mm. Six years earlier, a left cervical aneurysm of 24.1 mm in diameter was detected but the patient was asymptomatic during follow-ups. Diffusion-weighted magnetic resonance imaging revealed a fresh cerebral infarction in the left frontal cortex. The surgical procedure consisted of a skin incision from the mastoid