Internal carotid artery pseudoaneurysm masquerading as a peritonsillar abscess.

Blunt carotid arterial injuries are uncommon. Motor vehicle crashes are the most frequent cause, but this type of vascular injury can be secondary to any direct blow to the neck, intraoral trauma, or strangulation. Types of vascular injuries include dissection, pseudoaneurysm, thrombosis, rupture, and arteriovenous fistula formation. Patients with pseudoaneurysm of the internal carotid artery will usually present with neurologic complaints, ranging from the minor to complete stroke. On physical examination, neck hematoma, bruits, pulsatile neck mass, or a palpable thrill may be found. However, in 50% of cases, no external signs of neck trauma are observed. Onset of symptoms may occur within a few hours to several months after the initial injury. Angiography is considered the gold standard for diagnosis, but carotid Doppler ultrasound recently has been shown to be very sensitive in detecting these types of injuries. Treatment of pseudoaneurysm is often surgical, with endovascular stenting.