Coexistent intraventricular abnormalities in periventricular giant arachnoid cysts

Area of Science:

• Neurosurgery
• Pediatric Neurosurgery
• Neurology

Background:

• Arachnoid cysts are congenital malformations that can lead to hydrocephalus due to mass effect on cerebrospinal fluid (CSF) pathways.
• Previous studies have primarily attributed hydrocephalus associated with arachnoid cysts to mass effect, with less focus on potential intraventricular abnormalities.

Purpose of the Study:

• To investigate associated intraventricular abnormalities in patients with giant arachnoid cysts and hydrocephalus.
• To evaluate the efficacy of endoscopic exploration in diagnosing and treating CSF obstructions in these cases.

Main Methods:

• Seven patients with giant arachnoid cysts and hydrocephalus, previously treated with cystoperitoneal shunts, underwent endoscopic exploration.
• Procedures included cyst fenestration and treatment of identified intraventricular obstructions.

Main Results:

• Endoscopic findings revealed various obstructions, including cerebral aqueduct membrane, foramen of Monro occlusion, septum pellucidum hypoplasia, and quadrigeminal arachnoid cyst.
• Successful endoscopic interventions led to improved symptoms of increased intracranial pressure and hydrocephalus, with cyst and ventricular size reduction.

Conclusions:

• Intraventricular abnormalities, such as foramen of Monro stenosis and cerebral aqueduct occlusion, frequently accompany giant arachnoid cysts and contribute to hydrocephalus.
• These findings suggest a common developmental origin rather than a coincidental relationship.
• Endoscopic exploration is a valuable approach for managing CSF obstructions related to periventricular giant arachnoid cysts.