Carotid artery dissection
A tear in the carotid artery can cause stroke, especially in younger adults.
Carotid artery dissection happens when a tear develops in the wall of one of the two main carotid arteries in the neck. This tear lets blood seep between the artery’s layers, forcing them apart. As a result, a clot can form, the artery can narrow, and blood flow to the brain may be reduced—potentially leading to a stroke. The condition is a major cause of stroke in young and middle-aged adults.
Symptoms depend on how severe and where the dissection occurs. They can include a sudden, intense headache; pain in the neck or face; changes in vision; a drooping eyelid (Horner’s syndrome); and stroke-like signs such as weakness or numbness on one side of the body, trouble speaking, or loss of coordination.
A dissection may happen on its own (spontaneous) or be triggered by trauma—including minor injuries, certain medical conditions, or activities that involve neck movement. While spontaneous dissections are uncommon, they are increasingly recognized as a cause of stroke in younger people. Some cases are linked to hereditary connective tissue disorders like Marfan syndrome or Ehlers-Danlos syndrome, but most people with spontaneous dissections do not have such disorders. Trauma-related dissections often result from severe head or neck injuries, such as those from car accidents, strangulation, or sports like surfing and jiu-jitsu. Neck manipulation has also been reported as a possible cause, though the risk is debated.
Doctors diagnose carotid artery dissection using imaging tests like ultrasound, MRI, MRA, or CTA, which show the blood vessels and any abnormalities.
Treatment depends on the severity. Medications such as anticoagulants or antiplatelet drugs are often used to prevent clots and lower stroke risk. In more serious cases, surgery or endovascular procedures—like stenting or angioplasty—may be needed to restore normal blood flow. Early detection and treatment improve outcomes, though the prognosis varies based on the extent of the dissection and any complications.
- field
- Vascular medicine, neurology
- known_for
- Leading cause of stroke in young and middle-aged adults; separation of carotid artery wall layers
- incidence_rate
- 2.6 to 2.9 per 100,000 for spontaneous internal carotid artery dissection
- age_group
- More common in individuals under 50
- sex_prevalence
- Slightly more common in men than in women
Lore & Background
Carotid artery dissection occurs when a small tear forms in the innermost lining of the arterial wall, known as the tunica intima. This tear allows blood to enter the space between the inner and outer layers of the vessel, leading to either narrowing (stenosis) or complete occlusion. The stenosis in the early stages is a dynamic process, and some occlusions can quickly transition back to stenosis. When complete occlusion occurs, it can result in ischemia, but symptoms may not always be evident due to collateral circulation.
The condition can occur spontaneously or be triggered by trauma, including minor injuries, certain medical conditions, or activities that involve neck movement. Spontaneous dissection is an increasingly recognized cause of stroke that preferentially affects the middle-aged. Observational studies show that patients with spontaneous internal carotid artery dissection may have a history of stroke in their family or hereditary connective tissue disorders such as Marfan syndrome, Ehlers-Danlos syndrome, or fibromuscular dysplasia, though most people with spontaneous dissections do not have associated connective tissue disorders.
Traumatic causes include severe violent trauma to the head or neck, such as from motor vehicle accidents, sports-related activities like surfing and jiu-jitsu, and some forms of neck manipulation. The probable mechanism of injury is rapid deceleration with hyperextension and rotation of the neck, stretching the internal carotid artery over the upper cervical vertebrae and producing an intimal tear. There is significant controversy about the level of risk of stroke from neck manipulation.
Reader's Guide
Carotid artery dissection is a significant medical condition because it is a leading cause of stroke in young and middle-aged adults, accounting for approximately 5% to 22% of strokes in patients under 45 years of age. The condition's importance lies in its potential to cause irreversible brain damage through ischemic stroke, often occurring some time after the original dissection event. Early detection and treatment are crucial for improving outcomes, as blood clots or emboli originating from the dissection are responsible for causing infarctions in the majority of stroke cases.
Diagnosis is typically made through imaging studies such as ultrasound, MRI, MRA, or CTA, which help visualize blood vessel abnormalities. Treatment options include medications like anticoagulants or antiplatelet agents to prevent blood clot formation, and in more severe cases, surgical or endovascular interventions such as stenting or angioplasty may be required. The prognosis varies based on the extent of the dissection and the presence of complications.
The condition also highlights important uncertainties in medicine, such as the controversial association with neck manipulation and the variable prevalence of hereditary connective tissue diseases in affected individuals. Its recognition has increased since the early 1980s, and ongoing research continues to explore associations with anatomical variants like the styloid process (Eagle syndrome).
Did You Know?
- Carotid artery dissection is a leading cause of stroke in young and middle-aged adults.
- Spontaneous internal carotid artery dissection has an incidence rate of approximately 2.6 to 2.9 per 100,000 individuals.
- The condition can be associated with hereditary connective tissue disorders such as Marfan syndrome, Ehlers-Danlos syndrome, and fibromuscular dysplasia.
- There is significant controversy about the level of risk of stroke from neck manipulation.
More in Medical emergencies 1-24
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record