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Background and Purpose- Intracranial carotid artery calcification is associated with worse outcome in anterior circulation stroke patients who undergo endovascular thrombectomy. We investigated the association between vertebrobasilar artery calcification (VBAC) and outcome in patients undergoing endovascular thrombectomy for posterior circulation large vessel occlusion. Methods- Consecutive patients treated for posterior circulation large vessel occlusion from a prospective single-center registry were studied. VBAC was manually segmented on computed tomography brain scans. The associations between VBAC and VBAC volume, functional independence (90-day modified Rankin Scale score of 0-2), and 90-day mortality were assessed using propensity score-adjusted logistic regression. Results- Sixty-four posterior circulation large vessel occlusion patients were included. Twenty-five (39.1%) patients had VBAC, and of these, the median (interquartile range) VBAC volume was 19.8 (6.65-23.4) mm 3 . VBAC was associated with reduced functional independence (OR, 0.19 [95% CI, 0.04-0.78]; P =0.03) and increased mortality (OR, 9.44 [95% CI, 2.43-36.62]; P =0.005). Larger VBAC volumes were a significant predictor of reduced functional independence and increased mortality. Conclusions- VBAC is an independent predictor of outcome in patients undergoing endovascular thrombectomy for posterior circulation large vessel occlusion. Considering the presence of VBAC might improve prognostication and shared treatment decision-making between patients, families, and physicians.

Vertebrobasilar Artery Calcification and Outcomes in Posterior Circulation Large Vessel Occlusion Thrombectomy