[troutman]

https://www.pacificneuroscienceinsti.../colloid-cyst/

Fortunately, most symptomatic or large colloid cysts can now be safely removed through a minimally invasive endoscopic technique or brain port technique via a quarter-sized bony opening in the skull. This procedure typically resolves the hydrocephalus and associated symptoms.

These relatively uncommon benign cysts arise within the fluid filled regions of the brain, the ventricles. They typically occur at the junction between the lateral and third ventricles. The cyst consists of a thin lining surrounding a thick fluid-filled center. Once they reach a critical size, these cysts can block the normal flow of cerebrospinal fluid (CSF), increasing the pressure within the brain. Additionally, they can compress the nervous structures that process memory signals in the brain.