Citations

Background and Objectives: Cervical artery dissection (CeAD) is a leading cause of ischemic stroke in younger adults, yet sex-specific variations in its clinical presentation, imaging characteristics, and outcomes remain underexplored. We aimed to evaluate these differences using data from a large, multicenter registry. Methods: We analyzed data from the STOP-CAD registry, which includes patients with radiologically confirmed non-traumatic CeAD enrolled between 2015 and 2021 across multiple centers. Clinical and imaging characteristics were compared between men and women using multivariable logistic regression. Outcomes assessed included ischemic stroke recurrence at 180 days, excellent functional outcome (modified Rankin Scale [mRS] 0–1) at 90 days, symptomatic intracerebral hemorrhage (sICH), and mortality. Results: Among 4,023 patients with CeAD, 1,783 (44.6%) were women. Compared to men, women were younger (median age: 42 vs 50 years), more likely to have a history of migraine (26.9% vs 8.3%) and connective tissue disorders (14.3% vs 5.8%), and presented more frequently with non-ischemic symptoms such as headache, neck pain, or tinnitus (adjusted OR [aOR] 2.0; 95% CI, 1.8–2.3; p<0.001). Women had significantly higher odds of vertebral artery dissection (OR, 1.3; 95% CI, 1.2-1.5; p<0.001), multivessel involvement (OR, 2.1; 95% CI, 1.7-2.5; p<0.001), and pseudoaneurysm formation (OR, 1.3; 95% CI, 1.1-1.6; p=0.003). Despite these differences, there was no significant sex-based difference in key clinical outcomes: excellent functional recovery at 90 days (OR 0.94; 95% CI 0.76-1.15 p=0.542), ischemic stroke recurrence at 180 days (OR 0.56 CI 0.23-1.3 p=0.213), or mortality (OR 0.83; 95% CI 0.47-1.48, p=0.529). Conclusion: In this large international cohort, we observed women with CeAD were younger, more likely to present with non-ischemic symptoms with distinct imaging features. These underscore the need for heightened clinical suspicion of CeAD in women presenting with atypical symptoms, even in the absence of ischemic deficits or conventional vascular risk factors, and suggest that sex-specific phenotyping may enhance diagnostic accuracy and early management.

Background: Patients with cervical artery dissection (CAD) have a higher prevalence of cerebral aneurysms, likely due to underlying vasculopathies. Understanding risk factors and outcomes in this population may inform screening and management strategies. Methods: We conducted a post-hoc analysis of the STOP-CAD study, a multicenter international registry of patients with non-major trauma-related CAD across 63 centers. Cerebral aneurysms were identified based on medical history and intracranial vascular imaging obtained for dissection diagnosis. We compared demographic, clinical, laboratory, and imaging characteristics between patients with and without aneurysms. Variables with p<0.05 in univariate analysis were entered into a multivariable binary logistic regression to identify independent predictors. Clinical outcomes including ischemic stroke and symptomatic intracranial hemorrhage at follow-up were compared between both groups. Results: Out of 4023 patients included in the STOP-CAD study, 116 (2.9%) had at least one incidental cerebral aneurysm. In adjusted binary logistic regression, patients with cerebral aneurysm were more likely to have a history of migraine (aOR 1.78 95% CI 1.15-2.75, p=0.009), history of hypertension (aOR 1.65 95% CI 1.12-2.43, p = 0.010), known connective tissue disorder (aOR 3.47 95% CI 1.71-7.03), history of dissection (aOR 2.63 95% CI 1.31-5.28, p = 0.007), and a dissecting aneurysm at the site of the dissection (aOR 1.94 95% CI 1.25-3.01, p = 0.003). At follow-up, the presence of a cerebral aneurysm was not associated with ischemic stroke (7.8% vs. 5.6% p>0.1), but with a trend towards increased odds of symptomatic intracranial hemorrhage (3.4% vs. 1.2%, p = 0.062). Conclusions: Patients with CAD and concurrent incidental cerebral aneurysm were more likely to have a history of migraine headaches and markers of underlying vasculopathy and had a non-significantly increased risk of intracranial hemorrhage at follow-up. Further studies are needed to identify best practices for surveillance and risk stratification in this subgroup.

Background: Cervical artery dissection (CeAD) accounts for nearly 25% of all ischemic strokes in young adults. CeAD can lead to the development of dissecting aneurysms (DA). However, the incidence, risk factors and outcomes of CeAD patients with DA is not well established. This study aims to identify risk factors for developing DA, subsequent growth, and impact on patient outcomes. Methods: This is a secondary analysis of the Antithrombotics for Stroke Prevention in Cervical Artery Dissection (STOP-CAD), a multicenter cross-sectional international retrospective study. CeAD patients were stratified for the presence of DA. We used multivariable regression to identify factors associated with DA. Patients with DA were further analyzed for DA growth. The primary outcome was ischemic stroke after CeAD+DA diagnosis. Secondary outcomes included ischemic stroke after CeAD+DA with DA growth. Multivariable logistic regression analysis was used to assess the association between DA and risk factors. We also performed univariate Cox regression and generated Kaplan-Meier survival curves comparing study outcomes based on presence of DA and subsequent growth. Results: Of the 4023 patients included in the STOP-CAD study, 4008 were included in this analysis and 767 (19%) patients had DA (546 with DA on initial presentation). Patients with DA had a mean age of 46 [IQR 37-55] years and 50% (383) were women. In combined adjusted analyses, DA patients were more often non-Hispanic (aOR 0.63, 95% CI 0.41-0.94, p<0.02), more commonly had a history of migraine (aOR 1.27, 95% CI 1.01-1.59, p=0.037), connective tissue disorder (aOR 2.02, 95% CI 1.22-3.36, p=0.007), minor neck trauma (aOR 1.70, 95% CI 1.29-2.26, p<0.001) and were more likely to present with ischemic stroke (aOR 1.73, 95% CI 1.05-2.87, p=0.031). DA growth was noted in 55 out of 546 (10%) patients with DA on presentation. There was no significant difference in the risk of ischemic stroke by day 180 in patients with DA (hazard ratio [HR] 0.92 [95% CI, 0.65-1.30]; P =0.63) or DA growth (HR 2.40, [95% CI, 0.79-7.24]; P =0.12). Conclusion: In this subanalysis of STOP-CAD, nearly one in five patients with CeAD developed a DA. Factors associated with a higher likelihood of DA included non-Hispanic ethnicity, history of migraine, connective tissue disorder, minor neck trauma, and ischemic stroke at presentation. DA diagnosis and DA growth did not impact the risk of subsequent ischemic stroke at 6 months.

Background: The clinical characteristics and complications associated with de novo pseudoaneurysm formation beyond the acute phase of cervical artery dissection remain poorly defined. In this study, we examined the incidence, risk factors, and related ischemic and hemorrhagic events of post-acute de novo pseudoaneurysm formation. Methods: We analyzed data from the STOP-CAD study (Antithrombotic Treatment for Stroke Prevention in Cervical Artery Dissection). A de novo pseudoaneurysm was defined as a new (not present on initial imaging) focal enlargement in the diameter of the artery, greater than the native lumen. The incidence of de novo pseudoaneurysm was assessed at 90 days, 180 days, and beyond 180 days of follow-up. Univariate and multivariate regression analyses were conducted to identify risk factors for post-acute de novo pseudoaneurysm formation. Kaplan-Meier survival estimates were used to compare ischemic and hemorrhagic events between patients with and without de novo pseudoaneurysms. Results: Among 4008 patients, 546 were excluded as they had dissecting pseudoaneursyms on initial presentation. Therefore, 3,462 patients were included in this analysis of whom 220 patients (6.35%) developed a de novo pseudoaneurysm over a maximum follow-up of 4.4 years. Of these, 127 (57.72%) were detected within the first 90 days, and 172 (78.18%) within the first 180 days. In multivariate regression analyses, in addition to hypertension, active smoking and Hispanic ethnicity, fibromuscular dysplasia (FMD) was an independent risk factor for post-acute de novo pseudoaneurysm formation (adjusted OR: 2.160; 95% CI: 1.408–3.315; p < 0.001). Notably, the presence of a de novo pseudoaneurysm was not associated with a significant increase in ischemic (hazard ratio [HR] 1.43 [95% CI, 0.89–2.30]; P=0.14) or hemorrhagic events (hazard ratio [HR] 1.42 [95% CI, 0.43–4.69]; P=0.57). Conclusion: De novo pseudoaneurysm formation following a diagnosis of a cervical artery dissection is not uncommon and most frequently occurs within the first 180 days. FMD was independently associated with this complication. The development of a de novo pseudoaneurysm did not significantly increase the risk of subsequent ischemic or hemorrhagic events.

Background and Objectives: Pregnancy and the postpartum period increase the risk of cervical artery dissection (CEAD), a notable cause of stroke in young women. We aimed to describe the clinical presentation, imaging findings, and outcomes of CEAD occurring during pregnancy or shortly after delivery. Methods: We analyzed data from the STOP-CAD registry, a large international multicenter study of patients treated with antithrombotic therapy for non-traumatic CEAD between 2015 and 2021. This sub-study focused on women who were pregnant or within 12 weeks postpartum at the time of symptom onset. We assessed baseline clinical features, imaging results, acute stroke treatments, and functional outcomes. Results: Among 1,783 women in the registry, 62 (3.5%) had pregnancy-associated CEAD, with a median age of 34 years (IQR, 30-38). One-third had a history of migraine (33.9%), one-fifth had hypertension (21.0%), while other vascular risk factors were rare. Recent minor neck trauma was reported in 17.7%. Ischemic stroke symptoms occurred in 25 (40.3%) patients, and 23 (37.1%) had acute infarcts on imaging. However, most (59.7%) presented with non-ischemic symptoms. Vertebral artery dissections were more common than carotid dissections (62.9% vs. 48.4%), and 33.9% had multivessel involvement. Among patients presenting with ischemic stroke symptoms, 4 received thrombolysis and 7 underwent thrombectomy. Remarkably, 92% had excellent functional recovery (modified Rankin Score 0–1) at 90 days, and there were no stroke recurrences at 180 days. Conclusion: Pregnancy- and postpartum-associated CEAD is uncommon and associated with ischemic stroke in nearly half of patients. A history of migraine and hypertension may be potential risk factors. Despite the severity of presentation, most patients had favorable outcomes with timely treatment.

Background and Objectives: Cervical artery dissection (CeAD) is a common cause of ischemic stroke in young adults. We aim to identify age-based differences in clinical presentation, imaging findings, and outcomes after CeAD. Methods: This was a sub-study using the STOP-CAD registry, a multicenter cross-sectional international retrospective study of patients diagnosed with CeAD and treated with an antithrombotic from January 1, 2015 to December 31, 2021. Baseline clinical and imaging characteristics were compared between younger and older adults with CeAD (≤45 versus >45 years of age) using multivariable logistic regression. We chose this age cut off due to its frequent usage in stroke in the young literature. Multiple logistic regression models were used to determine association between young age and outcomes after CeAD (ischemic stroke at 180 days, excellent functional outcome with modified Rankin Scale of 0-1 at 90 days, and mortality) after adjusting for sex, vascular risk factors, CeAD characteristics, and NIHSS on presentation. Results: Among 4023 CeAD patients included in the study, 1901 (47.3%) were ≤45 years of age. Patients were followed for a median of 307 days (IQR 102-831). Young adults with CeAD were more likely to be women (Odds Ratio [OR], 2.4; 95% CI, 2.1-2.9; p<0.001), of Hispanic ethnicity (OR, 1.8; 95% CI 1.3-2.5; p<0.001), have a history of migraines (OR, 1.6; 95% CI, 1.3-2.0; p<0.001) and recent neck trauma (OR, 1.6; 95% CI, 1.3-1.9; p<0.001) while having fewer traditional vascular risk factors. Young adults with CeAD had higher odds of a non-ischemic presentation (OR, 1.3; 95% CI, 1.1-1.5; p=0.013), vertebral artery dissection (OR 2.5; 95% CI, 2.2-3.0; p<0.001), and multivessel involvement (OR 1.5; 95% CI, 1.1-1.9; p=0.004). In adjusted analysis, younger age was not associated with an increased risk of recurrent ischemic stroke (adjusted Hazard Ratio [HR], 0.48; 95% CI 0.2-1.2; p=0.119). Younger age was associated with significantly greater odds of excellent functional outcome at 90 days (aOR, 1.48; 1.20-1.84, p<0.001) and lower risk of death at follow up (aHR, 0.37; 95% CI, 0.17-0.81; p=0.012) after CeAD. Conclusion: In a large international cohort, young adults with CeAD had a distinct clinical phenotype with higher odds of non-ischemic presentation, vertebral artery dissection, and multivessel involvement while having fewer traditional vascular risk factors. Young adults had a decreased odds of disability and mortality after CeAD.

BACKGROUND: Cervical artery dissection (CeAD) may result in dissecting aneurysm (DA) formation. We aimed to characterize risk factors and clinical outcomes associated with DA in a large, international CeAD cohort. METHODS: We performed a secondary analysis of STOP-CAD (Antithrombotic Treatment for Stroke Prevention in Cervical Artery Dissection), an international, multicenter, retrospective cohort. Patients with spontaneous CeAD were assessed for DA at baseline and de novo DA formation. Significant covariates in univariable analysis were included in multivariable regression models aiming to identify factors associated with DA formation. Logistic regression and Cox proportional hazards models evaluated the association of DA with ischemic and hemorrhagic outcomes. RESULTS: Among 4008 patients with CeAD, 546 (13.6%) had a DA at baseline, and 221/2938 (7.5%) patients developed a de novo DA during follow-up, of which 172/221 (78.2%) were detected in the first 180 days. Patients with DA had a mean age of 47 years, and 383 (49.9%) were women. Baseline or de novo DA was associated with a history of connective tissue disorder (adjusted odds ratio [aOR], 2.02 [95% CI, 1.22–3.36]), fibromuscular dysplasia (aOR, 1.69 [95% CI, 1.28–2.25]), and multiple vessel dissection (aOR, 1.53 [95% CI, 1.19–1.98]). Lower odds of DA were seen in Hispanic ethnicity (aOR, 0.64 [95% CI, 0.43–0.97]) and ischemic stroke presentation (aOR, 0.41 [95% CI, 0.34–0.49]). Fibromuscular dysplasia was associated with de novo DA formation (aOR, 2.30 [95% CI, 1.52–3.49]). DA was not associated with ischemic stroke (hazard ratio, 0.71 [95% CI, 0.44–1.16]; P =0.173) or intracranial hemorrhage (HR, 1.09 [95% CI, 0.42–2.84]; P =0.86) by day 180. CONCLUSIONS: DAs are relatively common manifestations of CeAD, typically occurring within 6 months of CeAD diagnosis. DA was not associated with an increased risk of subsequent ischemic stroke or intracranial hemorrhage.

BACKGROUND: Patients with cervical artery dissection (CeAD) may experience a recurrent dissection, but its frequency, risk factors, and clinical implications are not well defined. We aimed to determine the risk, associated factors, and clinical impact of recurrent CeAD. METHODS: The STOP-CAD study (Antithrombotic Treatment for Stroke Prevention in Cervical Artery Dissection) was a multicenter international retrospective observational study of patients with CeAD treated between January 2015 and June 2022. Recurrent dissection was defined as a CeAD occurring at least 7 days after the diagnosis of the index event that affects a different artery or a different segment of the same artery. Patients were followed from day 7 up to 2 years. The absolute risk of recurrent CeAD over time was calculated using Kaplan-Meier survival estimates. Multivariable logistic and Cox regression models were used to assess predictors of CeAD recurrence. RESULTS: Of the 4023 patients included in STOP-CAD, 3836 (median age 46 years, 45% women) were eligible for this analysis. During a median (interquartile range) follow-up of 295 (97–720) days, 88 (2.29%) patients had a CeAD recurrence. Median time-to-recurrent CeAD was 53 (interquartile range, 18–157) days. The estimated risk of recurrent CeAD at 2 years was 3.22% (95% CI, 2.59%–4.00%). In multivariable analyses, younger age (adjusted odds ratios, 0.98 [95% CI, 0.96–0.99]), migraine (adjusted odds ratio, 1.88 [95% CI, 1.14–3.07]), and fibromuscular dysplasia (adjusted odds ratio, 2.90 [95% CI, 1.66–5.06]) were associated with CeAD recurrence, while presenting with an ischemic stroke was associated with a lower likelihood of recurrence (adjusted odds ratio, 0.47 [95% CI, 0.29–0.75]). These associations with CeAD recurrence over time were confirmed by Cox regression analyses. Among the 88 patients with recurrent CeAD, only 5 had accompanying ischemic events (3 strokes, 2 transient ischemic attacks). CONCLUSIONS: In this retrospective study, recurrent CeAD was uncommon, approximately half of the events were diagnosed within the first 2 months of the index event, and recurrent events rarely caused new ischemic events. Younger age, migraine, absence of ischemic stroke at presentation, and signs of fibromuscular dysplasia may help identify high-risk patients.

Objective Cervical artery dissection (CeAD) may be limited to the extracranial extradural space or extend to the intradural space. Intradural extension can potentially increase the risk of stroke and subarachnoid hemorrhage. However, the factors associated with intradural extension and its impact on clinical outcome remain unclear. Methods This was a secondary analysis of the STOP‐CAD observational, multi‐center study. Patients with CeAD and intradural extension (CeADid) were compared with those with pure CeAD extradural dissections (CeADed) using multiple regression analyses. Results Of 4,023 patients with CeAD, 534 (13.3%) had CeADid. In comparison to patients with CeADed, those with CeADid more often had clinical overt stroke or transient ischemic attack (TIA) at presentation, acute infarcts on imaging, a vertebral artery affected, and severe stenosis of the involved vessel ( p < 0.001 for all). In contrast, carotid involvement and complete occlusions were more frequent in patients with CeADed ( p < 0.001 for both). CeADid was associated with a shift in the distribution of scores on the modified Rankin Scale (mRS) toward worse functional outcome (odds ratio [OR] = 0.76, 95% confidence interval [CI] = 0.62–0.92) but the odds for favorable outcomes (mRS = 0–2) did not differ between the groups after appropriate adjustments on multivariate analysis. CeADid was independently associated with higher mortality at 180 days on multivariate analysis (adjusted OR = 2.84, 95% CI = 1.50–5.38). Interpretation CeADid is associated with more severe clinical presentation, a shift toward less favorable outcomes, and higher mortality rates. These findings suggest that CeADid may represent a high‐risk type of CeAD. ANN NEUROL 2026;99:1189–1197

BACKGROUND: Small, randomized trials of patients with cervical artery dissection showed conflicting results regarding optimal stroke prevention strategies. We aimed to compare outcomes in patients with cervical artery dissection treated with antiplatelets versus anticoagulation. METHODS: This is a multicenter observational retrospective international study (16 countries, 63 sites) that included patients with cervical artery dissection without major trauma. The exposure was antithrombotic treatment type (anticoagulation versus antiplatelets), and outcomes were subsequent ischemic stroke and major hemorrhage (intracranial or extracranial hemorrhage). We used adjusted Cox regression with inverse probability of treatment weighting to determine associations between anticoagulation and study outcomes within 30 and 180 days. The main analysis used an as-treated crossover approach and only included outcomes occurring with the above treatments. RESULTS: The study included 3636 patients (402 [11.1%] received exclusively anticoagulation and 2453 [67.5%] received exclusively antiplatelets). By day 180, there were 162 new ischemic strokes (4.4%) and 28 major hemorrhages (0.8%); 87.0% of ischemic strokes occurred by day 30. In adjusted Cox regression with inverse probability of treatment weighting, compared with antiplatelet therapy, anticoagulation was associated with a nonsignificantly lower risk of subsequent ischemic stroke by day 30 (adjusted hazard ratio [HR], 0.71 [95% CI, 0.45–1.12]; P =0.145) and by day 180 (adjusted HR, 0.80 [95% CI, 0.28–2.24]; P =0.670). Anticoagulation therapy was not associated with a higher risk of major hemorrhage by day 30 (adjusted HR, 1.39 [95% CI, 0.35–5.45]; P =0.637) but was by day 180 (adjusted HR, 5.56 [95% CI, 1.53–20.13]; P =0.009). In interaction analyses, patients with occlusive dissection had significantly lower ischemic stroke risk with anticoagulation (adjusted HR, 0.40 [95% CI, 0.18–0.88]; P interaction =0.009). CONCLUSIONS: Our study does not rule out the benefit of anticoagulation in reducing ischemic stroke risk, particularly in patients with occlusive dissection. If anticoagulation is chosen, it seems reasonable to switch to antiplatelet therapy before 180 days to lower the risk of major bleeding. Large prospective studies are needed to validate our findings.