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Carotid Artery Dissection

Dissection of Carotid Artery

Carotid artery dissection describes the entry of blood to the walls of the artery occurring due to arterial tear.


Carotid artery dissection has a wide range of presentation. It should be suspected in patients who suffered major trauma, direct pressure over the neck or minor stress and with uncommon focal neurological findings, particularly those that involve cranial nerves. The absence of clinical suspicion in the appropriate patient population may render the physician vulnerable to legal prosecution.

Carotid artery dissection with major trauma should be especially suspected in the presence of flexion, rotation or hyperextension of the neck. Symptoms may not be immediately detected and sometimes require up to 5 days after the injury to appear.

Patients with minor trauma can also be susceptible to carotid dissection, especially if the trauma involves gymnastics, yoga, coughing, sneezing, painting in the overhead position, chiropractic manipulation, and various sports injuries. Symptoms may vary from headaches to paralysis.

The most common symptoms associated with carotid artery dissection are swelling of the neck, headaches with varying presentations (sharp or throbbing in character, or continuous, progressive and instantaneous in duration), amaurosis fugax resulting from a decrease in retinal blood perfusion and that manifests with transient loss of sight, partial Horner syndrome characterized by ptosis, miosis and pain, muscle weakness in a focal pattern, abnormal taste perception, pulsatile tinnitus occurring in 25% of all cases and other symptoms that are typical of a migraine such as scintillating scotomas and periodic disturbances in the visual field.

Pain in the face and behind the eye can occur in 25% of all patients with carotid artery dissection. Some cases of headaches with cluster-like features have been also described [9].

Carotid Bruit
  • Examination may reveal neurological deficits, Horner's syndrome (half of cases), hemiparesis, carotid bruit.[patient.info]
  • There was no carotidynia (a neck pain syndrome associated with tenderness to palpation over the carotid bifurcation) or carotid bruit. A chest radiograph obtained to rule out an underlying left apical superior sulcus tumor was normal.[journals.plos.org]
Vascular Disease
  • .- ) Diseases of the circulatory system I77 ICD-10-CM Diagnosis Code I77 Other disorders of arteries and arterioles 2016 2017 2018 2019 Non-Billable/Non-Specific Code Type 2 Excludes collagen (vascular) diseases ( M30-M36 ) hypersensitivity angiitis ([icd10data.com]
  • He was initially diagnosed with angioedema and treated with corticosteroids and antihistamines. His tongue swelling persisted and subsequently developed unilateral weakness.[ncbi.nlm.nih.gov]
  • There were no signs of ocular erythema, proptosis or palpable orbital mass.[ncbi.nlm.nih.gov]
Transient Blindness
  • Episodes of transient blindness, syncope, swelling neck and pulsating tinnitus may also occur. Examination may reveal neurological deficits, Horner's syndrome (half of cases), hemiparesis, carotid bruit.[patient.info]
Pulsatile Tinnitus
  • Herein, we report a rare case of cervical artery dissection in which pulsatile tinnitus was the only reported symptom. A 38-years-old man attended our hospital with a 4-days history of left side pulsatile tinnitus which began after stumbling.[ncbi.nlm.nih.gov]
  • tinnitus, and, rarely, subarachnoid hemorrhage.(2) Cerebral hyperperfusion syndrome is known to occur after carotid artery revascularization procedures and it is thought to result from the combination of several factors that impair cerebral vascular[ncbi.nlm.nih.gov]
  • tinnitus, or hearing one’s own heartbeat If a person shows one or more of these symptoms, especially after some form of trauma, call 9-1-1 immediately for transportation to the nearest comprehensive stroke treatment center for emergency diagnosis and[tgh.org]
  • tinnitus [11] – This can occur in as many as 25% of patients with dissection of the internal carotid artery Decreased taste sensation (hypogeusia) Focal weakness Migrainelike symptoms (eg, a scintillating scotoma, which is loosely defined as a transient[emedicine.medscape.com]
  • tinnitus Ischemia: TIA/stroke with associated anterior circulation deficits (hemiparesis, hemisensory loss, aphasia, neglect, amaurosis fugax) Patient with severe head/face/neck trauma that develops neurologic deficits Diagnosis First line: CTA neck[emdocs.net]
Neck Pain
  • The relative risk of ICA dissection after cervical spine manipulation compared with other health care interventions for neck pain, back pain, or headache is also unknown.[ncbi.nlm.nih.gov]
  • […] artery dissection (CeAD) occurs preferentially in the middle-aged, and its annual incidence rate is 2.6 to 3.0 per 100,000.(1) Manifestations of internal carotid artery dissection (ICAD) include ischemic stroke and TIA ( 70% of patients), headache, neck[ncbi.nlm.nih.gov]
  • We present a case of a 31-year-old Caucasian woman who was 11 weeks pregnant and presented with neck pain, headache, vomiting and left side Horner's syndrome.[ncbi.nlm.nih.gov]
  • We present a case of spontaneous carotid artery dissection in a previously healthy 48-year-old woman who presented with neck pain and elevated inflammatory markers.[ncbi.nlm.nih.gov]
  • Neck Pain (7) This is usually posterior neck pain in 50% of patients. Headache (7) It occurs in 60% of patients It is almost always occipital.[resus.com.au]
Muscle Weakness
  • This crossing of pain and temperature loss, helps in making the diagnosis Vestibulo-cerebellar Symptoms Multidirectional nystagmus Diplopia Vertigo Autonomic Dysfunction Ipsilateral Horner’s Syndrome Ipsilateral Bulbar muscle weakness Dyspohonia Dysphagia[resus.com.au]
  • weakness in a focal pattern, abnormal taste perception, pulsatile tinnitus occurring in 25% of all cases and other symptoms that are typical of a migraine such as scintillating scotomas and periodic disturbances in the visual field.[symptoma.com]
  • We present a patient who incurred carotid artery dissection and stroke after release of postdistraction coronoid-zygomatic ankylosis for the treatment of mandibular micrognathia.[ncbi.nlm.nih.gov]
  • Here, the authors describe the first known case of symptomatic ICA dissection caused by a giant osteophyte due to atlantoaxial osteoarthritis.[ncbi.nlm.nih.gov]
  • Abstract Mandibular distraction osteogenesis is an increasingly accepted treatment option for severe upper airway obstruction in grade 3 Robin sequence.[ncbi.nlm.nih.gov]
Facial Pain
  • Headache (including neck and facial pain) is usually described as constant and severe and is commonly ipsilateral to the dissected artery.[emedicine.medscape.com]
  • pain Partial horner’s syndrome (ptosis and miosis without anhidrosis); sympathetic fibers associated with facial sweating are associated closely with external carotid artery and NOT the ICA Cranial nerve palsies (CN XII most common), abnormal taste,[emdocs.net]
  • Clinical Manifestations: Dissection of the cervical portion of a carotid artery is associated with unilateral headache, neck pain, facial pain, incomplete Horner’s syndrome (myosis, ptosis, absent anhydrosis), CN palsy (CN XII most common), amaurosis[emdocs.net]
  • Carotid dissection may present with headache, neck and facial pain ipsilateral to dissection, which precede development of a stroke. Episodes of transient blindness, syncope, swelling neck and pulsating tinnitus may also occur.[patient.info]
  • Classification and diagnosis criteria for headache disorders, cranial neuralgias and facial pain. Cephalalgia . 1988 ; 8 :1–28. Crossref Google Scholar 8 Damasio H. A computed tomographic guide to the identification of cerebral vascular territories.[doi.org]
  • CONCLUSIONS: Our study shows that CAD is an independent and significant causative factor for acute ischemic stroke.[ncbi.nlm.nih.gov]
  • […] occlusion strokes and isolated anterior circulation occlusions.[ncbi.nlm.nih.gov]
  • KEYWORDS: Carotid artery dissection; Endovascular treatment; Stroke[ncbi.nlm.nih.gov]
  • Spontaneous CAD is associated with vessel redundancy, and the risk of acute stroke is greatest with occlusive CAD.[ncbi.nlm.nih.gov]
  • Copyright 2016 National Stroke Association. Published by Elsevier Inc. All rights reserved. KEYWORDS: Aortic dissection; acute ischemic stroke; cystic medial necrosis; three dimensional computed tomography angiography[ncbi.nlm.nih.gov]
  • On arrival in the emergency department the patient began reporting of right-sided headache. Neurological examination revealed left-sided reduced sensation with weakness.[ncbi.nlm.nih.gov]
  • A 47-year-old male presented with intermittent episodes of headache, blurry vision, anisocoria, and loss of taste sensation following a whiplash injury while body surfing.[ncbi.nlm.nih.gov]
  • CASE PRESENTATION: A 38-year-old Sri Lankan female presented with sudden onset severe headache, fixed dilated pupil, complete ptosis and ophthalmoplegia on the right side.[ncbi.nlm.nih.gov]
  • The relative risk of ICA dissection after cervical spine manipulation compared with other health care interventions for neck pain, back pain, or headache is also unknown.[ncbi.nlm.nih.gov]
  • Patients can present to us with a sudden severe headache, also known as a thunderclap headache.[resus.com.au]
Frontal Headache
  • The patient complained of episodic left-sided neck pain and frontal headache. Cerebral ischemia was suspected.[em-consulte.com]
Focal Neurologic Deficit
  • We report a case of stylocarotid syndrome in a 60-year-old man who presented with a right internal carotid artery (ICA) dissection and focal neurological deficits.[ncbi.nlm.nih.gov]


Carotid dissection can only be diagnosed with imaging. Sometimes a bruit can be heard on physical exam but, in itself, the finding is not diagnostic. Potential imaging modalities include duplex ultrasound, CT angiography and MR angiography [10]. Duplex ultrasound has positive and negative factors that can influence its use. It is widely available, does not require an invasive procedure and is very affordable. Nonetheless, it is not sufficient to diagnose the majority of cases, especially that the majority of dissections are usually present on the base of the skull. Positive findings will usually show a dissection flap. On the other hand, CT and MR angiography will most commonly show a narrowed lumen of the internal carotid artery, sometimes called a "flare". The signs typically resemble a flame. Other possible findings include a crescent form filled, a dissection flap or a pseudoaneurysm.

Carotid artery dissections can also be discovered incidentally. These cases will require the determination if the dissection is acute or not. In case it is acute, the patient will require anticoagulation treatment. In case the dissection is chronic, only anti-platelet medications are needed. Assessing the time of the dissection is usually done with a T2 MRI sequence. T2 MRI helps in determining the characteristics of the hemoglobin that is present within the walls of the vessel. A positive signal indicates that the dissection is subacute.

The gold standard for the diagnosis of carotid artery dissection is digital subtraction arteriography. Nonetheless, it is an invasive method and usually, MR or CT angiography are preferred. The main advantages of MR over CT angiography is that it does not require any radiation dose and the contrast injected is usually more benign. CT angiography, on the other hand, can be more easily available. In addition, recent systematic reviews on dissections of the vertebral artery have shown that CT angiography is more accurate than MR angiography.

  • We calculated the volume and extension of the hyperintense intramural hematoma using T1w and PD/T2w fat suppressed sequences and assessed the degree of stenosis due to the hematoma using magnetic resonance angiography.[ncbi.nlm.nih.gov]
  • Fat-suppressed T1-weighted images (right) showed high signal intensity in the arterial walls, consistent with intramural haematomas. The coughing fits in combination with physical activity were considered to be the likely cause of the dissection.[tidsskriftet.no]


Treatment of carotid artery dissection will depend first on whether it is diagnosed after the occurrence of a stroke or not. In patients diagnosed with carotid artery dissection at the time of the occurrence of a stroke, treatment is aimed at resolving the neurological complications.

On the other hand, when a patient is diagnosed before a stroke has taken place, the goal of the treatment is the prevention of any cerebrovascular incident. This is usually dependent on the cause of the dissection, whether it occurred subsequent to trauma or a pathological entity such as Marfan syndrome, where the injury took place and on the comorbidities of the patient.

Initial treatment is usually with anticoagulants. These drugs help in preventing the formation of blood clots within the carotid artery which may later embolize into the vessels of the brain and cause serious neurological damage [11]. This is done with the administration of heparin through the IV route and then with oral warfarin. Duration of treatment can vary, but patients are generally recommended to take the medication for three to six months.

Other potential medications that can be used are antiplatelet drugs, in the form of aspirin, clopidogrel or ticlopidine. Anti-platelet medications have a different mode of action than anticoagulants, although both types of medication are effective in the prevention of blood clot formation. They can substitute anticoagulants or they can be used in combination. Current evidence suggests that both medication types are equally effective in the prevention of clotting.

Some patients may only be treated with procedural intervention. These are generally minimally invasive surgeries. They are generally recommended for patients who are symptomatic on warfarin (for example, these patients still complain of weakness or disturbances in the visual fields), patients in whom anticoagulant and antiplatelet medications are restricted and those who suffer from a severe decrease in cerebral blood perfusion subsequent to the stroke.

Interventional treatment consists of angioplasty or stent placement. Angioplasty helps in repairing the section of the artery where the dissection occurred. A stent, on the other hand, has the ability to maintain the vessel open [12]. Long-lasting treatment is best achieved with a combination of these two methods.


50% of all patients with spontaneous carotid artery dissection suffer strokes with residual neurological damage, although 75% will ultimately recover [8]. Carotid artery dissections can be complicated by long lasting effects such as continuous headaches, that may persist for years. The mortality rate for spontaneous dissection is smaller than 5%.

Patients who suffer from carotid artery dissections following trauma such as sports injuries or car accidents generally fare worse, with a considerably higher mortality rate. The risk of stroke depends greatly on the type and severity of the injury, with an incidence level that varies from 3 to 44%. Neurological impairment occurs in around 37% to 58% of all patients with secondary dissections.

The risk of recurrence is approximately 1% for every year and within 10 years following the initial incident. Recurrence is more likely to occur in younger patients, although young patients can also expect better outlooks and response to treatment.


Spontaneous carotid artery dissection is most of the times related to diseases with connective tissue abnormalities and is very uncommon in otherwise healthy individuals. Some of the associated conditions include Marfan syndrome, Ehlers-Danlos syndrome type IV, fibromuscular dysplasia and inflammation through vasculitis. Nonetheless, it is important to mention that a close association between Marfan syndrome and carotid artery dissection has not been fully established. Furthermore, patients with underlying diseases usually suffer from widespread connective tissue abnormalities that also affect other structures and organs. Genetic predispositions may amplify the risk.

Secondary carotid artery dissection occurs subsequent to secondary causes such as trauma or medical intervention. Trauma follows most commonly as whiplash injuries in car accidents or severe fits of coughing [3]. On the other hand, catheterization of the carotid artery can lead to an initmal tear and ultimately secondary carotid artery dissection.


The incidence of secondary carotid artery dissection following blunt injuries or trauma is 1 to 3%, although the real value may be much more elevated since many dissections are either asymptomatic or result in temporary and mild symptoms that are subsequently not diagnosed [4]. This contrasts to an incidence of 2.5 to 3 cases for every 100,000 individuals for spontaneous carotid artery dissection [5].

Carotid artery dissection is particularly prevalent among young patients who suffer from ischemic strokes. In fact, it is responsible for around 25% of all ischemic strokes that occur in young and middle-aged patients younger than 50. Patients affected from ischemic strokes due to carotid artery dissection after blunt injuries or trauma have a mean age ranging from 35 to 38 years.

Most dissections of the carotid artery occur outside the cranium. The intracranial part of the internal carotid artery is not very mobile and the skull is able to withstand the damage in most cases of trauma.

Sex distribution
Age distribution


Carotid artery dissection is a multifactorial disease with involvement of both mechanical factors such as stretching, blunt injury and trauma and disorders of connective tissue such as Ehlers-Danlos syndrome type IV [6].

The first stage of carotid artery dissection is a tear of the intima or, in some cases, a direct insult to the tunica media. The latter usually begins in the vasa vasorum. This is followed by a rush of blood that eventually leads into a hematoma within the walls of the artery, resulting in the formation of a thrombus. The thrombus can block the lumen of the carotid artery or eventually results in distal embolization [7].

Some cases of carotid artery dissection may be complicated by the formation of aneurysms. These aneurysms are true rather than false aneurysms because they involve all layers of the blood vessels. Aneurysms tend to occur when the blood dissects within the space lying between the media and the adventitia. The aneurysm can also result in distal embolization or exert pressure on adjacent structures, especially sympathetic and cranial nerves.


Carotid artery dissection can be prevented by decreasing the risk of cardiovascular disease in general. This can be achieved by combating hypertension, diabetes, and obesity with cessation of smoking, a regular exercise regimen, and healthy dieting.

Patients who are more prone to carotid artery dissection because of an underlying pathology must be monitored and followed up accordingly by a specialist in vascular medicine.


Carotid artery dissection is a medical condition, in which a tear in the carotid arteries results in a rush of blood within the walls of the vessel. This can result in a decrease in the diameter of the artery, compromising blood supply to the brain or in the formation of clots which can subsequently embolize and lead to stroke. Carotid artery dissection can occur after a trauma, particularly whiplash injuries in motor vehicle accidents or in association with connective tissue diseases such as Ehlers-Danlos or Marfan syndrome [1]. Patients can be asymptomatic or show a wide range of symptoms such as a headache, visual field disturbances or swelling of the neck. The gold standard of diagnosis is arteriography, although this is rarely performed because of the invasive nature of the procedure and its potential complications. Computed tomography (CT) and magnetic resonance (MRI) angiography are generally used to diagnose the condition. Treatment depends on the cause of the dissection and associated circumstances but generally, consists of antiplatelet and anticoagulation medication [2]. Patients can sometimes be diagnosed with carotid artery dissection following a stroke. In this case, treatment is directed at the complications of the stroke.

Patient Information

Carotid artery dissection occurs when a tear in the structure of the blood vessel permits the entry of blood into its walls. The carotid arteries are present at the base of the skull. Dissection can occur after trauma or pathological conditions that make vessels more vulnerable to injury. It can eventually lead to a decrease in the lumen of the artery or the formation of blood clots. These can then travel into the small vessels of the brain where they can compromise perfusion and lead to strokes. Patient present with varying symptoms but they may also be completely asymptomatic. Common symptoms include disturbances in vision, headaches or swelling in the neck. Diagnosis is established with imaging, in particular with CT or MR angiography. Arteriography is the gold standard but is rarely used because it is an invasive procedure with a higher rate of complications. Treatment of carotid artery dissection varies on the cause and circumstances of the event. Generally, medications that thin the blood and prevent the formation of clots are used. Physicians may also opt to surgically intervene and repair the defect or install a stent in the artery that keeps it open.



  1. Goyal MS, Derdeyn CP. The diagnosis and management of supraaortic arterial dissections. Curr Opin Neurol. 2009 Feb; 22(1):80-9.
  2. Cothren CC, Moore EE, Biffl WL, et al. Anticoagulation is the gold standard therapy for blunt carotid injuries to reduce stroke rate. Arch Surg. 2004; 139(5):540-5; discussion 545-6.
  3. De Bray JM, Baumgartner RW. History of spontaneous dissection of the cervical carotid artery. Arch Neurol 62. 2005;(7):1168–1170.
  4. Schievink WI. Spontaneous dissection of the carotid and vertebral arteries. N Engl J Med. 2001; 344(12):898-906.
  5. Baker WE, Wassermann J. Unsuspected vascular trauma: blunt arterial injuries. Emerg Med Clin North Am. 2004; 22(4):1081-98.
  6. Debette S, Leys D. Cervical-artery dissections: predisposing factors, diagnosis, and outcome. Lancet Neurol. 2009; 8(7):668-78.
  7. Redekop GJ. Extracranial carotid and vertebral artery dissection: a review. Can J Neurol Sci. 2008; 35(2):146-52.
  8. Baumgartner RW. Management of spontaneous dissection of the cervical carotid artery. Acta Neurochir Suppl. 2010;107:57-61.
  9. Tobin J, Flitman S. Cluster-like headaches associated with internal carotid artery dissection responsive to verapamil. Headache. 2008;48(3):461-6.
  10. Stallmeyer MJ, Morales RE, Flanders AE. Imaging of traumatic neurovascular injury. Radiol Clin North Am. 2006;44(1):13-39, vii.
  11. Cothren CC, Moore EE, Biffl WL, et al. Anticoagulation is the gold standard therapy for blunt carotid injuries to reduce stroke rate. Arch Surg. 2004; 139(5):540-5; discussion, 545-6.
  12. Xianjun H, Zhiming Z. A systematic review of endovascular management of internal carotid artery dissections. Interv Neurol. 2013; 1(3-4):164-70.

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Last updated: 2018-06-21 21:27