Colloid Cysts Home Conditions Colloid Cysts What are Colloid Cysts? Colloid cysts are benign, fluid filled sacs that arise typically at the junction of lateral ventricles and the third ventricle, often causing obstructive hydrocephalus. When symptomatic, these cysts should be removed surgically. This can be done endoscopically or with a keyhole minimally invasive craniotomy for more complex cysts. Generally, surgical resection alone can treat the hydrocephalus, minimizing the need for placement of a ventriculoperitoneal shunt. More information about colloid cysts Written and reviewed by: The Pacific Neuroscience medical and editorial team We are a highly specialized team of medical professionals with extensive neurological and cranial disorder knowledge, expertise and writing experience. Last updated: April 6, 2020 Schedule an appointment Schedule a consultation or record review via phone or online. icon-quote Get a second opinion Learn more about your treatment options. icon-stethoscope Find a doctor Make an appointment at a center of excellence.