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Sinus pericranii in the setting of a posterior fossa pilocytic astrocytoma: illustrative case

Youngkyung Jung, Jennifer L. Quon, and James M. Drake

postoperative magnetic resonance venogram (MRV), likely secondary to reduced compression ( Fig. 3 ). However, the patient continued to have high EVD output, and we decided to proceed with an endoscopic third ventriculostomy, as there was some reluctance in passing a shunt tunneler near the venous network. Pathological evaluation by frozen section was consistent with a pilocytic astrocytoma. FIG. 3. Postoperative axial ( A ) and sagittal ( B ) T1-weighted MRI with contrast demonstrating interval resection of lesion with improved hydrocephalus and mass effect of fourth