These are benign lesions often found in or near the foramen of Monroe, between the lateral and third ventricles. If they are large enough, they can cause sudden obstructive hydrocephalus which can be life-threatening.
If the patient is presenting with headaches, vomiting or confusion, please send them to the Emergency Department immediately as this is a life-threatening condition.
If there is hydrocephalus reported on imaging, please refer urgently to the on-call team via Refer a Patient.
If the colloid cyst is seen incidentally on imaging in the absence of acute symptoms or reported hydrocephalus, please refer to the Neuro-Oncology MDT. See Neurosurgery for details of how to do this
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