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Ş. O. Dörtkol and E. Ekizoğlu
follow-up within less than 1 month. All these features fullled third edition of the International Classication of Headache Disorders (ICHD-3) diagnostic criteria for
acute headache or facial or neck pain attributed to cervical carotid or vertebral artery dissection.

22.7 Clinical Characteristics

The third edition of the International Classication of Headache Disorders (ICHD-3) established specic criteria to make the diagnosis of headache or facial or neck pain associated with cervical artery or vertebral artery dissection. These diagnostic crite­ria were given in Table22.1 [19].
Factors inuencing the development of headaches associated with CAD were reported to be female gender, dissection affecting posterior circulation, prior history of headaches, and low-density lipoprotein levels [20]. Acute onset headache was observed in 53% of the patients, and 35% of these patients experienced headache as the initial symptom. Therefore, artery dissections should also be assessed in the dif­ferential diagnosis of thunderclap headache [21].
The pain was reported to be throbbing pain in one third (35%) of the patients and localized usually on one side of the head or neck (71.7%) [22]. In carotid artery dis­sections, pain was most frequently localized in the temporal region (46%), followed by the frontal region (19.2%). In contrast, in vertebrobasilar artery dissections, the
Table 22.1 ICHD-3 diagnostic criteria for acute headache or facial or neck pain attributed to cervical carotid or vertebral artery dissection
A.Any new headache and/or facial or neck pain fullling criteria C and D B.Cervical carotid or vertebral dissection has been diagnosed C.Evidence of causation demonstrated by at least two of the following:
1. Pain has developed in close temporal relation to other local signs of the cervical artery dissection, or has led to its diagnosis
2. Either or both of the following:
(a) Pain has signicantly worsened in parallel with other signs of the cervical artery
dissection
(b) Pain has signicantly improved or resolved within 1month of its onset
3. Either or both of the following
(a) Pain is severe and continuous for days or longer (b) Pain precedes signs of acute retinal and/or cerebral ischemia
4. Pain is unilateral and ipsilateral to the affected cervical artery
D.Either of the following:
1. The headache has revolved within 3months
2. The headache has not yet resolved, but 3months have not yet passed
E.Not better accounted for by another ICHD-3 diagnosis
22 Headache or Facial or Neck Pain Attributed to Cervical Carotid or Vertebral…
213
occipital region and the nape of the neck stood out as the locations where the pain was most frequently observed (79.7%) [22]. The severity of the headache may vary depending on age. A previous study compared the clinical features of dissections in the young population and the elderly and observed that both neck pain and head­aches were more frequently experienced by young people than the elderly [23].
In a recently published review that evaluates the clinical characteristics of patients with CAD, it has been reported that headache was a more prevalent symp­tom in cases of vertebral artery dissection than in those of carotid artery dissection [22]. Furthermore, Uludüz etal. observed that patients with vertebral artery dissec­tion experienced more frequent headaches with higher rates of photophobia and phonophobia in comparison to patients with carotid artery dissection [24]. Another report has also described a case of vertebral artery dissection with migraine-like headache accompanied by photophobia and nausea [25]. The higher rates of head­ache, photophobia, and phonophobia in patients with vertebral artery dissection are thought to be associated with trigeminovascular system activation [26]. However, another study evaluating 51 patients with vertebral artery dissection reported that only 4% of the patients reported photophobia at the time of diagnosis [27]. In a survey conducted by Mayer-Suess etal., headaches occurred frequently with a sud­den onset in patients with arterial dissection. The character of the pain in vertebral artery dissection was often described as a pulling sensation, whereas in carotid artery dissection, it was typically characterized as dull and throbbing. Furthermore, among patients with vertebral artery dissection, it was noted that the duration of headaches was signicantly longer than in carotid artery dissection [28]. A recent study reported that headaches associated with CAD were more severe, more often unilateral, and more frequent than those associated with large artery occlusion. It was also found that headaches were frequently throbbing in patients with dissection, but pulsating in those with occlusion [29].
The relationship between migraine and CAD has also been reported in some reports, although the sample sizes were usually limited to small groups. While an association between migraine with aura and CAD has been reported [29], a cohort study investigating 2485 ischemic stroke patients showed that the prevalence of CAD was higher in patients with migraine without aura compared with migraine with aura [19].
It should also be noted that clinical presentations in CAD may vary depending on the localization and the surrounding structures of the dissected segment as well. Horner’s syndrome is mostly seen in carotid dissections because pericarotid sympa­thetic bers are frequently affected. However, vertebrobasilar dissections cause symptoms associated with brainstem ischemia, such as vertigo, ataxia, and nausea [30, 31]. One of the most common presentations in patients is cerebral ischemia, which occurs in two-thirds of patients [4]. Symptoms are consistent with the isch­emic area in these patients. Rarely seen presentations include retinal infarctions leading to monocular vision loss or ischemic optic neuropathy [32, 33].
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Ş. O. Dörtkol and E. Ekizoğlu

22.8 Diagnostic Workup

Several neuroimaging tests are helpful in the diagnosis of arterial dissection. Computed tomographic angiography (CTA) has half the spatial resolution of digital subtraction angiography (DSA) and twice the spatial resolution of magnetic reso­nance angiography (MRA) [34]. Rapid image acquisition and widespread availabil­ity make CTA the most frequently preferred diagnostic method. The specicity (67–100%), sensitivity (64–100%), negative (70–100%), and positive predictive (65–100%) values of CTA for the detection of cervical or cephalic arterial dissec­tion are comparable to those of DSA [3537]. An asymmetrical and irregular vessel wall appearance is the most common nding. Intramural hematoma is seen as a crescent-shaped hyperdensity in addition to the thickening of the vessel wall [38]. CTA can also easily demonstrate intimal aps and pseudoaneurysms, which is a common consequence of extracranial dissection and occur in 13–49% of patients with CAD [39]. Although well-tolerated and relatively safe and less invasive than DSA, CTA involves exposure to iodinated contrast and radiation, which may be harmful for patients with impaired renal function or allergies to contrast material. CTA is a neuroimaging test that is relatively contraindicated during pregnancy and in childhood [40].
The combination of axial T1-weighted cervical MRI examination with fat sup­pression is used for a noninvasive imaging modality to detect dissection. It is more sensitive to detect small intramural hematomas than CT imaging [41]. The charac­teristic MRI nding is the hyperintense crescent sign observed on T1-weighted and FLAIR sequences that results from intramural leaking of the blood, causing the intramural hematoma that appears in the shape of a half-moon spiral [4143]. Recent studies have also demonstrated the effectiveness and reliability of susceptibility- weighted imaging (SWI) in detecting intramural hematoma [44]. Other abnormalities that can be identied through magnetic resonance imaging (MRI) include vessel diameter enlargement and hyperintense signal abnormality on the entire vessel, compromise of the vessel lumen by the adjacent tissue with an abnormally increased signal, and poor to no visualization of the vessel [45].
Digital subtraction angiography is accepted as the gold standard test to iden­tify and reveal the features of dissected segments. This procedure allows dynamic characterization of the blood ow across the lesion. However, it carries risks of stroke, retroperitoneal hemorrhage, vascular perforation, and contrast-induced nephropathy [46].

22.9 Treatment

Although there is a limited number of studies on the treatment of dissections, the most important treatment step is the acute treatment to prevent possible complica­tions such as ischemic stroke or subarachnoid hemorrhage. The primary therapeutic
22 Headache or Facial or Neck Pain Attributed to Cervical Carotid or Vertebral…
215
management strategy is therefore to start antiplatelets or anticoagulants as soon as possible for stroke prevention in CAD [47]. Acute treatment with intravenous thrombolysis and/or mechanical thrombectomy is also recommended in selected cases [41]. However, other symptoms, such as headaches, may also require treat­ment. It has been observed that headaches secondary to dissections may improve with antimigraine medications [41]. Medical management is based on both empiri­cal and clinical observations. Nevertheless, a previous study showed that headaches associated with CAD had a better prognosis than headaches caused by other vascu­lar causes [48].

22.10 Prognosis

There are very few studies evaluating the long-term prognosis of headaches asso­ciated with CAD.Evaluations of the clinical course of internal carotid artery dis­sections have noted that headaches resolved within a short time frame in a signicant portion of patients [49]. As headaches improve typically shortly after the diagnosis, prolonged headaches are rarely reported in the literature. Analgesics are administered to the majority of patients and are benecial in the majority of the reported cases. Only one case has been documented in which the headache resolved after a short course of steroid treatment [50]. Infrequently, arterial dis­sections with dissecting aneurysms can lead to subarachnoid hemorrhage. A poorer prognosis was observed in these cases where dissecting aneurysms occur [51]. Recurrence of dissections has a low rate of approximately 1% during at least 1 year of follow-up [9].

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Chapter 23
Post-endarterectomy Headache
PauloSergioFaroSantos

23.1 Introduction

Endarterectomy is the treatment of choice for the prevention of stroke in patients with symptomatic carotid stenosis [1]. Although this procedure is generally safe and effective, postoperative headache is a recognized but often underestimated compli­cation [14]. The objective of this chapter is to present and analyze in depth a clini­cal case of post-endarterectomy headache with its characteristics and management.

23.2 Pathophysiology

The pathophysiology of post-endarterectomy headache is not yet fully understood, but some hypotheses may help in understanding the mechanism of this head­ache, namely:
Oculosympathetic autonomic dysfunction: In a case series of post- endarterectomy
headache, a group of patients who developed cluster headache phenotype had signicantly decreased oculosympathetic activity compared with the control group without headache. The authors suggest that damage to the sympathetic plexus resulting from the surgical procedure may be involved in the development of postoperative headache.
Cerebral hemodynamic abnormalities: Björne et al. described the case of a
patient with chronic cluster headache who had been in remission for over 20years and who, the day after carotid endarterectomy, returned to experience attacks identical to his previous headache. It is known that pharmacologically
P. S. FaroSantos (*) Faro Institute, Curitiba, PR, Brazil
Switzerland AG 2026 D. Uludüz et al. (eds.), Rare Causes of Headache Disorders, Headache,
https://doi.org/10.1007/978-3-032-10242-3_23
221© The Author(s), under exclusive license to Springer Nature
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P. S. FaroSantos
induced vasodilation can trigger an attack in a susceptible individual during a period of cluster headache. This knowledge led them to suspect that the state of cerebral hyperperfusion caused by the restoration of blood ow after the surgical procedure had reactivated the headache in this patient [5, 6]. In addition, cerebral hyperperfusion syndrome, a rare complication characterized by headache, focal neurological decits and seizures in the absence of cerebral ischemia, is well described and is also believed to be related to failure of cerebral blood autoregu­lation [7].
Activation of the Trigeminovascular System: Surgical manipulation of vascular
and nervous structures during the procedure can activate the trigeminovascular system and cause the release of several chemical mediators, including calcitonin gene related peptide (CGRP) and substance P, leading to vasodilation and sensi­tization of pain pathways, contributing to the manifestation of headache [5, 8].

23.3 Case Presentation

A 64-year-old man was diagnosed with a transient ischemic attack due to recurrent episodes of left hemiparesis lasting up to 30min. The patient had a past medical history of hypercholesterolemia and a sedentary lifestyle. He denied any history of recurrent headaches. Neurological examination revealed no focal decits. Brain magnetic resonance imaging (MRI) showed no signs of acute ischemia, but only white matter hyperintensities on uid-attenuated inversion recovery (FLAIR) (Fazekas 2), with no other signicant changes. Cervical arterial computed tomogra­phy (CT) angiography revealed substantial carotid stenosis (>70%) of the right internal carotid artery, for which he underwent carotid endarterectomy.
From the fth postoperative day onwards, he developed a moderate-intensity right-sided fronto-orbitotemporal headache, which occurred in attacks lasting between 20 and 40min, once a day, and was associated with conjunctival hyper­emia, lacrimation, and rhinorrhea ipsilateral to the pain. His blood pressure was within normal limits.
Due to the pattern of symptoms, the patient was treated acutely with oxygen, obtaining a good therapeutic response. A new cervical arterial magnetic resonance imaging and angioresonance were performed, but they did not show ischemic or hemorrhagic lesions, nor arterial stenosis or dissection. As the headache attacks continued daily for more than 1week, verapamil was started, and the headache regressed approximately 40days later.