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Updated: May 15, 2026

Endoscopic Approach for Colloid Cyst Resection
Published on: May 23, 2025
Ependymal cyst of the midbrain
Ruth Prieto1, Issa Subhi-Issa, José M Pascual
1Department of Neurosurgery, Virgen de La Salud Hospital, Toledo. rpieto29@hotmail.com
Abstract:
We present the case of a 30-year-old man who developed an acute hydrocephalus secondary to an obstruction of the cerebral aqueduct by a midbrain cystic lesion. After a ventriculo-peritoneal shunt was placed to relief symptoms of intracranial hypertension, the patient underwent a neuronavigation-assisted endoscopic fenestration of the cyst. A careful immunohistochemical staining confirmed the diagnosis of an ependymal cyst. An extensive review of the literature has revealed that this is the first report of a periaqueductal ependymal cyst with definite histological diagnosis. This is a rare cause of acute non-communicating hydrocephalus but an important entity in the differential diagnosis.
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