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Figure 6: Venous angle. Type IA: true venous angle with ASV joining at the angle which lies adjacent to the posterior margin of the FoM. Type IB: true venous angle with ASV joining the main stem of ICV far beyond the FoM. Type IIA: false venous angle with ASV joining at the angle which lies far beyond the FoM. Type IIB: false venous with ASV joining the main stem of ICV. Yellow area shows the space available to access the mid-superior third ventricle via transchoroidal approach expanding the FoM posteriorly. The more posterior the venous angle and its junction of ASV, more the corridor to access the midsuperior third ventricle. (ASV: anterior septal vein, BVR: basal vein of Rosenthal, FoM: foramen of Monro, ICV: internal cerebral vein, TSV: thalamostriate vein, VoG: vein of Galen)

Figure 6: Venous angle. Type IA: true venous angle with ASV joining at the angle which lies adjacent to the posterior margin of the FoM. Type IB: true venous angle with ASV joining the main stem of ICV far beyond the FoM. Type IIA: false venous angle with ASV joining at the angle which lies far beyond the FoM. Type IIB: false venous with ASV joining the main stem of ICV. Yellow area shows the space available to access the mid-superior third ventricle via transchoroidal approach expanding the FoM posteriorly. The more posterior the venous angle and its junction of ASV, more the corridor to access the midsuperior third ventricle. (ASV: anterior septal vein, BVR: basal vein of Rosenthal, FoM: foramen of Monro, ICV: internal cerebral vein, TSV: thalamostriate vein, VoG: vein of Galen)