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Abstract
Arachnoid cysts most probably arise from incomplete separation of the perimedullary mesh (endomeninx) during the early stages of embryogenesis.
Arachnoid cysts present due to compressing adjacent neural structures, increasing the intracranial pressure by their own mass effect and by obstructing CSF flow and causing hydrocephalus.
Endoscopic management of arachnoid cysts is a safe and effective
modality provided that each case is approached individually and studied
carefully intraoperatively.