Fig 1. A, Coronal T2-weighted image shows an enlarged right cavernous sinus with flow void and a right temporofrontal parenchymal hyperintense lesion. B, Axial T2-weighted image shows the enlarged right cavernous sinus, a right middle cerebellar peduncle lesion, and right-sided proptosis. C, Lateral view of right external carotid angiography shows the DAVM. The right cavernous sinus is large and predominantly draining into spheno-parietal sinus and its tributaries. D, T2-weighted MR image 9 months later shows increased mass effect from the parenchymal lesion. Corresponding DW image (E) and ADC map (F) with values ranging from 1.2 to 1.6 x 10^–3 mm²/s. G, T2-weighted MR image 24 months later shows venous infarction in the affected region with resolution of mass effect. DW image (H) and ADC map (I) with values ranging from 1.0 to 2.1 x 10^–3 mm²/s.