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.

According to US neurosurgeon, Dr Anthony D'Ambrosio, the growth develops within the third ventricle of the brain ... If large enough, a colloid cyst obstructs the movement of cerebrospinal ...

This structure was a cystic extension of the cavum veli interpositi (CVI), which is a narrow CSF-filled space between the lateral ventricles, inferior to the fornices, and superior to the third ...