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Case 2, intraoperative findings. (a) The left foramen of Monro was firmly obstructed by inflammatory substances that represented an obstacle for foraminoplasty (arrow). (b) A thin, semi-transparent portion (arrow) of septum was identified posterior to the anterior septal vein. Fenestration was performed in this portion using the techniques mentioned in Figure 2. (c) The septal fenestration was successfully completed. CP, colloid plexus.
