Colloid cysts are generally slow-growing, non-cancerous brain tumours located in the third ventricle, a fluid-filled cavity in the centre of the brain. Though they are benign, colloid cysts need ...

What is a colloid cyst and are they dangerous? Colloid cysts are generally slow-growing, non-cancerous brain tumours located in the third ventricle, a fluid-filled cavity in the centre of the brain.

Davina explained how colloid cysts are very rare, saying three people in a million get them. They are small fluid-filled sacs located in or around the lateral and third ventricle of the brain.