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Figure 3: (A) Intraoperative photograph showing a soft gelatin sponge placed over the aqueduct occluding it. The tumor adherence to the floor of fourth ventricle is seen vividly. (B) Intraoperative photograph showing the swollen soft gelatin sponge covering the aqueduct. There is still come CSF egress from the aqueduct. (C) Intraoperative photograph showing roof of the fourth ventricle, which prevents excessive influx of air in the aqueduct (D) Intraoperative photograph showing the aqueduct vividly following resection of the fourth ventricular tumor in another patient. The roof of the fourth ventricle is elevated by the suction cannula

Figure 3: (A) Intraoperative photograph showing a soft gelatin sponge placed over the aqueduct occluding it. The tumor adherence to the floor of fourth ventricle is seen vividly. (B) Intraoperative photograph showing the swollen soft gelatin sponge covering the aqueduct. There is still come CSF egress from the aqueduct. (C) Intraoperative photograph showing roof of the fourth ventricle, which prevents excessive influx of air in the aqueduct (D) Intraoperative photograph showing the aqueduct vividly following resection of the fourth ventricular tumor in another patient. The roof of the fourth ventricle is elevated by the suction cannula