Hu YS, Guo WY, Lin CJ, et al. - This study was conducted to analyze the accuracy of unenhanced MRI/3-dimensional time-of-flight (3D TOF) MRA in evaluating cavernous sinus dural arteriovenous fistula (CSDAVF) obliteration as compared with digital subtraction angiography (DSA). In this study, 48 cases of CSDAVFs received Gamma Knife surgery (GKS) and had undergone both unenhanced MRI/3D TOF MRA and DSA for posttreatment evaluation between 1995 and 2012. The outcomes of MRI/MRA were independently interpreted by two blinded observers. Researchers reported the sensitivity (the probability of MRI/MRA showing obliteration when DSA showed complete obliteration), specificity, positive predictive value, and negative predictive value for CSDAVF obliteration. After GKS, unenhanced MRI/3D TOF MRA alone may be sufficient to document the complete obliteration of CSDAVFs. After a sufficient latency period, time-resolved MRA or DSA can be reserved for a suspected residual CSDAVF after GKS.