Arachnoid cyst is a cerebrospinal fluid cyst, the walls of which are formed by arachnoid cells or cicatricial collagen. Arachnoid cysts are located between the surface of the brain and the arachnoid membrane.
Primary (true) arachnoid cysts are congenital formations, secondary ones arise after meningitis, surgery, Marfan syndrome, agenesis of the corpus callosum, etc.; with secondary arachnoid cysts, the wall is an arachnoid scar. Arachnoid cysts are four times more common in men than in women; usually localized within the liquor cisterns rich in arachnoid membranes, expanding them.
Arachnoid cysts may be accompanied by headaches, nausea and vomiting, ataxia and hemiparesis, hallucinations, convulsive syndrome, mental disorders, etc. (more often cerebral symptoms associated with secondary hydrocephalus prevail, less often focal symptoms, including cysts with traumatic the formation of a hygroma).
The surgical treatment of symptomatic arachnoid cysts is performed using endoscopic techniques. All interventions are performed through a trephination hole with a diameter of 8 mm with the installation of an endoscopic port with a diameter of 6 mm.