TO THE EDITOR: We read with great interest one of the Consortium for Dural Arteriovenous Fistula Outcomes Research (CONDOR) studies by Abecassis et al.1 (Abecassis IJ, Meyer RM, Levitt MR, et al. Recurrence after cure in cranial dural arteriovenous fistulas: a collaborative effort by the Consortium for Dural Arteriovenous Fistula Outcomes Research (CONDOR). J Neurosurg. 2022;136[4]:981-989). In this study, the risk factors for the recurrence of dural arteriovenous fistulas (dAVFs) after putative cure were identified as tentorial location, cortical venous drainage, and deep cerebral venous drainage. This is the largest follow-up study to determine the rate of dAVF recurrence after initial cure. A delayed long-term angiographic evaluation (at least 1 year after cure) is advised, particularly in cases with recurrence risk factors. This article also discussed in great detail why fistulas recurred after complete penetration of the fistulous point and drainage vein: it is generally accepted to be related to suboptimal casting of the draining vein. The recurrence of fistulas is actually the result of a dAVF that is temporarily angiographically silent but anatomically intact.