Correction to: Successful Reperfusion With Mechanical Thrombectomy Is Associated With Reduced Disability and Mortality in Patients With Pretreatment Diffusion-Weighted Imaging–Alberta Stroke Program Early Computed Tomography Score ≤6

BackgroundAlthough accumulating evidence has demonstrated the benefit of mechanical thrombectomy (MT) in patients with low Alberta Stroke Program Early Computed Tomography Score (ASPECTS), it is still unclear how workflow metrics impact the clinical outcomes of this subgroup of patients.MethodsPatients with acute stroke and diffusion-weighted imaging (DWI) ASPECTS ≤5 at baseline, who underwent MT within 6 hours of symptoms onset, were included from a prospectively maintained national multicentric registry between January 1, 2012 to August 31, 2017. The degree of disability was assessed by the modified Rankin Scale (mRS) at 90 days. The primary outcome was functional independence defined as mRS 0 to 2 at 90 days.ResultsThe study included 291 patients with baseline DWI-ASPECTS ≤5. Good outcome was achieved in 82 (28.2%) patients, and 104 (35.7%) patients died within 90 days. Successful reperfusion (modified Thrombolysis In Cerebral Infarction (mTICI) 2b-3) rate was 75.3%, and median onset to recanalization (OTR) time was 2 268min. Among time-related variables, OTR emerged as the strongest predictor of primary outcome (adjusted OR for every 60 min 0.59, 95% CI 0.44 to 0.77; p<0.001). mTICI 2c-3 independently predicted a good outcome (adjusted OR 1.91, 95% CI 1.004 to 3.6; p=0.049) along with age and baseline DWI-ASPECTS. Recanalization status failed to significantly impact outcome in the DWI-ASPECTS 0–3 subpopulation.ConclusionsNear complete reperfusion (mTICI 2c-3) and OTR are the strongest modifiable outcome predictors in patients with DWI-ASPECTS ≤5 treated with MT.

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Primary and secondary cholesteatomas, cholesterol granuloma, and mucocele of the temporal bone: Role of computed tomography and magnetic resonance imaging with emphasis on diffusion-weighted imaging

Operative Techniques in Otolaryngology-Head and Neck Surgery ◽

10.1016/j.otot.2013.11.006 ◽

2014 ◽

Vol 25 (1) ◽

pp. 36-48

Author(s):

Mahmood F. Mafee ◽

Asae Nozawa

Keyword(s):

Magnetic Resonance Imaging ◽

Computed Tomography ◽

Magnetic Resonance ◽

Temporal Bone ◽

Diffusion Weighted Imaging ◽

Cholesterol Granuloma ◽

Resonance Imaging ◽

Diffusion Weighted

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Outcomes of Mechanical Thrombectomy in Patients with Large Diffusion-Weighted Imaging Lesions

Journal of Korean Neurosurgical Society ◽

10.3340/jkns.2021.0064 ◽

2021 ◽

Author(s):

Yong-Hwan Cho ◽

Jae Hyung Choi

Keyword(s):

Diffusion Weighted Imaging ◽

Mechanical Thrombectomy ◽

Diffusion Weighted ◽

Large Diffusion

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e-ASPECTS derived acute ischemic volumes on non-contrast-enhanced computed tomography images

International Journal of Stroke ◽

10.1177/1747493019879661 ◽

2019 ◽

Vol 15 (9) ◽

pp. 995-1001

Author(s):

Simon Nagel ◽

Olivier Joly ◽

Johannes Pfaff ◽

Panagiotis Papanagiotou ◽

Klaus Fassbender ◽

...

Keyword(s):

Computed Tomography ◽

Clinical Outcome ◽

Diffusion Weighted Imaging ◽

Clinical Severity ◽

Stroke Severity ◽

Lesion Volume ◽

Computed Tomography Perfusion ◽

Computed Tomography Images ◽

Diffusion Weighted ◽

Ischemic Core

Background and purpose Validation of automatically derived acute ischemic volumes (AAIV) from e-ASPECTS on non-contrast computed tomography (NCCT). Materials and methods Data from three studies were reanalyzed with e-ASPECTS Version 7. AAIV was calculated in milliliters (ml) in all scored ASPECTS regions of the hemisphere detected by e-ASPECTS. The National Institute of Health Stroke Scale (NIHSS) determined stroke severity at baseline and clinical outcome was measured with the modified Rankin Scale (mRS) between 45 and 120 days. Spearman ranked correlation coefficients (R) of AAIV and e-ASPECTS scores with NIHSS and mRS as well as Pearson correlation of AAIV with diffusion-weighted imaging and CT perfusion-estimated ischemic “core” volumes were calculated. Multivariate regression analysis (odds ratio, OR with 95% confidence intervals, CI) and Bland–Altman plots were performed. Results We included 388 patients. Mean AAIV was 11.6 ± 18.9 ml and e-ASPECTS was 9 (8–10: median and interquartile range). AAIV, respectively e-ASPECTS correlated with NIHSS at baseline (R = 0.35, p < 0.001; R = −0.36, p < 0.001) and follow-up mRS (R = 0.29, p < 0.001; R = −0.3, p < 0.001). In subsets of patients, AAIV correlated strongly with diffusion-weighted imaging ( n = 37, R = 0.68, p < 0.001) and computed tomography perfusion-derived ischemic “core” ( n = 41, R = 0.76, p < 0.001) lesion volume and Bland–Altman plots showed a bias close to zero (−2.65 ml for diffusion-weighted imaging and 0.45 ml forcomputed tomography perfusion “core”). Within the whole cohort, the AAIV (OR 0.98 per ml, 95% CI 0.96–0.99) and e-ASPECTS scores (OR 1.3, 95%CI 1.07–1.57) were independent predictors of good outcome Conclusion AAIV on NCCT correlated moderately with clinical severity but strongly with diffusion-weighted imaging lesion and computed tomography perfusion ischemic “core” volumes and predicted clinical outcome.

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Relationship between carotid plaque characteristics and new ischemic lesions after stenting detected by computed tomography angiography

Acta Radiologica ◽

10.1177/0284185119852732 ◽

2019 ◽

Vol 61 (1) ◽

pp. 47-55

Author(s):

Hongying Qu ◽

Xiaokun Zhang ◽

Miao Zhang ◽

Yongan Gao ◽

Jie Lu

Keyword(s):

Risk Factors ◽

Computed Tomography ◽

Carotid Artery ◽

Carotid Artery Stenting ◽

Carotid Plaque ◽

Diffusion Weighted Imaging ◽

Irregular Surface ◽

Irregular Surfaces ◽

Diffusion Weighted ◽

Peripheral Position

Background Although carotid artery stenting achieves definite benefits, it carries a higher rate of embolization compared with carotid endarterectomy. The incidence of embolization may be related to plaque stability. Purpose To assess for any relationship between plaque characteristics and cerebral emboli following carotid artery stenting. Material and Methods Sixty-three patients with severe carotid stenosis underwent carotid artery stenting. They were divided into two groups according to whether new ischemic lesions were detected on diffusion-weighted imaging after carotid artery stenting. We evaluated the types and locations of calcification in plaques and extent of calcification. We then assessed for a correlation between each of these factors and occurrence of new lesions on diffusion-weighted imaging after carotid artery stenting. Results The locations of calcification, percentage of plaque enhancement, and the number of plaques with irregular surface or ulceration were significantly different between the two groups. A peripheral position of calcification (close to the adventitia), enhancing plaques, and plaques with irregular surfaces or ulceration were statistically significant predictors of intracerebral embolization after carotid artery stenting. No significant differences in type of plaque or degree of calcification were found between two groups. Conclusion Peripheral calcification, enhancing plaques, and plaques with irregular surfaces were risk factors for intracerebral embolization after carotid artery stenting. These plaque characteristics should be considered when choosing the optimal treatment for patients.

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