Colloid Cysts in Neuroendoscopic Surgery

Colloid cysts are benign, gelatinous lesions typically located at the anterior aspect of the third ventricle, adjacent to the foramen of Monro. Their strategic position can obstruct cerebrospinal fluid flow, leading to obstructive hydrocephalus, raised intracranial pressure and acute neurological deterioration. Neuroendoscopic surgery has emerged as a minimally invasive strategy for cyst excision, offering direct visualisation through ventricular pathways and the potential for reduced tissue disruption compared with open microsurgery. Advances in endoscopic optics, neuronavigation and instrument design have refined cyst removal techniques, enabling complete aspiration or en bloc resection of the capsule in many cases. Nevertheless, the proximity of critical structures—such as the fornix and deep venous pathways—poses risks of memory impairment, venous infarction and postoperative seizures. Preoperative imaging protocols now routinely include high-resolution MRI sequences to delineate cyst morphology, relationships to venous angles and ventricular anatomy. Intraoperative strategies focus on controlled aspiration of cyst contents, meticulous capsule dissection and haemostatic management within the third ventricle. Long-term follow up highlights durable relief of hydrocephalus and low recurrence rates, while underscoring the importance of systematic neurocognitive monitoring and tailored rehabilitation when deficits arise.

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Colloid Cysts in Neuroendoscopic Surgery publication trend

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Technical terms

Colloid cyst: A benign, epithelial-lined lesion filled with gelatinous material, usually located in the third ventricle.

Neuroendoscopic surgery: A minimally invasive procedure using an endoscope to visualise and operate within the ventricular system.

Hydrocephalus: A pathological accumulation of cerebrospinal fluid in the brain’s ventricles, causing increased pressure and ventricular dilation.

Foramen of Monro: The anatomical channel connecting each lateral ventricle to the third ventricle through which cerebrospinal fluid flows.

Neurocognitive testing: Formal assessment of cognitive domains—memory, attention, executive function and visuospatial ability—often performed by a neuropsychologist.

References

1. Neurocognitive Safety of Endoscopic Colloid Cyst Resection: Paired Pre- and Post-Operative Cognitive Function from an Exploratory Cohort. Cancers (2025).
2. Neurocognitive Complications after Ventricular Neuroendoscopy: A Systematic Review. Behavioural Neurology (2020).
3. Microsurgical vs. Endoscopic Excision of Colloid Cysts: An Analysis of Complications and Costs Using a Longitudinal Administrative Database. Frontiers in Neurology (2017).