title: Erratum.
abstract: The original versions of Tables 1–4 that were contained in the article "International Retrospective Study of the Pipeline Embolization Device: A Multicenter Aneurysm Treatment Study" by D.F. Kallmes, R. Hanel, D. Lopes et al (AJNRAmJ Neuroradiol 2015;36:108–15, originally published on-line on October 29, 2014, 10.3174/ajnr.A4111) contained errors. Due to a coding problem, 36 PICA and vertebral artery aneurysms were changed from "anterior" to "posterior." In addition, 17 ICA aneurysms were changed from "other anterior" to "ICA." The authors state that these changes do not affect the conclusions or clinical implications of their paper. The only outcome that changed in statistical significance was the comparison of the rates of neurologic mortality and neurologic morbidity + mortality between anterior and posterior circulation aneurysms at >30 days (Table 3). These are the corrected tables.