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Colloid cysts represent histologically benign tumors almost always located in the third ventricle. These epithelial-lined cysts are filled with gelatinous material that usually contains mucin, old blood, cholesterol, or ions. They account for approximately 0.5%–2% of all primary brain tumors, mostly located at the rostral end of the third ventricle, or near the foramen of Monro. 1

As colloid cysts are a rare developmental and slow-growing malformation, they may be silent during childhood, remaining asymptomatic and identified incidentally on imaging. 2 They can become symptomatic in the third to sixth decades of life by a variety of symptoms, including headache, diplopia, dizziness, cognitive decline, vertigo, nausea/vomiting, and gait disturbance. 3 Chronic or sudden acute hydrocephalus or death due to rapid cyst growth can happen in 5% to 12% of the cases. 4, 5, 6, 7, 8, 9