World Neurosurg
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Cavernous malformations are angiographically occult vascular hamartomas without intervening neural tissue that represent an estimated 10% of central nervous system vascular pathologies.1 Management is often dictated by lesion location, intranidal versus extranidal hemorrhage, presenting symptoms, acuity of onset, and surgical accessibility. Deep-seated cavernous malformations are often adjacent to eloquent structures, including functional white matter tracts that must be accounted for during surgical planning and respected during resection of the cavernoma. Exoscopic-guided channel-based approaches can help minimize retraction of brain tissue while providing a navigated, direct path to the target lesion.2 We report a case of an 18-year-old man who presented with seizures and was found to have a hemorrhagic third ventricular cavernous malformation resulting in hydrocephalus. ⋯ An uneventful gross total resection was achieved and confirmed using an angled endoscope to inspect the cavity walls, the "exoscopic to endoscopic or E2E approach" (Video 1). The patient developed transient short-term memory dysfunction in the immediate postoperative period, likely due to retraction of the fornix, which dramatically improved with speech therapy and rehabilitation. The patient provided informed consent for surgery and video recording.