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neuroglial_cyst

Neuroglial cyst

Neuroglial cysts (also known as glioependymal cysts) are rare, benign epithelial-lined cystic lesions that can potentially occur anywhere in the neuraxis. On imaging they are characterised as CSF-like parenchymal cysts with smooth, rounded borders and minimal-to-no surrounding signal intensity abnormality.

Epidemiology

They are rare and represent <1% of intracranial cysts.

Pathology

Neuroglial cysts are congenital lesions that develop a sequestration of neural tube embryonic elements that develop into a glial cell lined, fluid filled cavity, located within the white matter 4. Location

They can be intra- or extra-parenchymal with the former being more common. The frontal lobe is thought to be the most typical location 1,3.

Radiographic features

CT

Typically seen as a well defined, non enhancing, hypodense (CSF density) unilocular cystic lesion with no surrounding oedema. They do not calcify. MRI

Neuroglial cysts usually follow CSF signal. Hence they are hypointense on T1 and hyperintense on T2. They do not enhance with gadolinium. They are usually suppressed on T2 FLAIR sequences. Differential diagnosis

General imaging differential considerations include:

Porencephalic cyst: communicates with the lateral ventricle, usually shows surrounding gliosis

Arachnoid cyst: typically extra-axial, enlarged perivascular space, typically multiple cluster around the basal ganglia

Neurocysticercosis: usually <1 cm, partially enhance

cerebral hydatid cyst: usually spherical, may be indistinguishable

Ependymal cyst: periventricular, may be indistinguishable

Epidermoid cyst: usually do not follow CSF signal in all sequences restricted diffusion

neuroglial_cyst.txt · Last modified: 2017/08/23 11:55 by administrador