Figure 1 Cranial CT before surgery on May 7, 2020   Axial CT showed the high-density shadow in straight sinus (arrow indicates, Panel 1a). Axial CT showed the low-density shadow in the bilateral thalamus (arrows indicate, Panel 1b). Sagittal reconstruction CT showed the high-density shadow in straight sinus, vein of Galen and internal cerebral vein (arrow indicates, Panel 1c). Anteroposterior and lateral CTV did not reveal straight sinus, vein of Galen and internal cerebral vein (Panel 1d, 1e).

Figure 2 Intraoperative lateral DSA findings of endovascular treatment   Cerebral angiography during endovascular treatment did not reveal straight sinus, vein of Galen and internal cerebral vein (Panel 2a). Microcatheter angiography confirmed the catheter was in the straight sinus (Panel 2b). Stent was released in the straight sinus (arrow indicates, Panel 2c). Catheter was aspirated in the straight sinus (arrow indicates, Panel 2d). Balloon was dilated in the straight sinus (arrow indicates, Panel 2e). Microcatheter angiography showed recanalization of most of the straight sinus, with partial filling defect in it (arrows indicate, Panel 2f).

Figure 3 Cranial imaging findings on 7th day after operation   Axial CT showed bilateral temporal horn returned to normal, the high-density shadow in the sinus region disappeared (Panel 3a). Axial CT showed low-density shadow in bilateral thalamus disappeared (Panel 3b). Sagittal reconstruction CT showed high-density shadow in the straight sinus, vein of Galen and internal cerebral vein disappeared (Panel 3c). Lateral CTV showed recanalization of the straight sinus, vein of Galen and internal cerebral vein (Panel 3d).

Figure 4 Cranial MRI findings one year after operation   Axial T₁WI showed bilateral thalamus returned to normal (Panel 4a). Axial T₂WI (Panel 4b) and FLAIR (Panle 4c) showed abnormal hypointensity in the bilateral thalamus (arrows indicate). Lateral MRV showed recanalization of the straight sinus, vein of Galen and internal cerebral vein (Panel 4d).