Glioependymal/ependymal cyst

Glioependymal cysts, also known as ependymal cysts or neuroepithelial cysts, are rare benign intracranial cysts that arise within the brain parenchyma or ventricles. They are lined by a single layer of ependymal or glial cells and are filled with clear fluid that closely resembles cerebrospinal fluid (CSF). These cysts are thought to result from the sequestration of developing neuroepithelium during embryogenesis, making them congenital in origin, though they may not become clinically apparent until later in life. Glioependymal cysts primarily affect the central nervous system and can occur in various locations within the brain, including the frontal and temporal lobes, as well as in periventricular white matter. Many of these cysts are discovered incidentally on brain imaging and remain asymptomatic throughout life. However, when they grow large enough to exert mass effect on surrounding brain structures or obstruct CSF flow, they can cause symptoms such as headaches, seizures, focal neurological deficits, hydrocephalus, cognitive changes, or increased intracranial pressure. The specific symptoms depend largely on the size and location of the cyst. Treatment is generally not required for asymptomatic cysts, which may be monitored with periodic neuroimaging. When symptomatic, surgical intervention may be considered, including options such as stereotactic aspiration, cyst fenestration, endoscopic drainage, or cyst-peritoneal shunting. Complete surgical excision can be curative but is not always feasible depending on the cyst's location. The prognosis is generally favorable, particularly when the cyst can be adequately drained or resected, though recurrence is possible after incomplete treatment.

Inheritance

Sporadic

Usually appears on its own, not inherited from a parent

Age of Onset

Variable

Can begin at different ages, from infancy through adulthood

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