Arachnoid cyst

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Notion

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Science and technology

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What Wikipedia says

Arachnoid cysts are cerebrospinal fluid covered by arachnoidal cells and collagen that may develop between the surface of the brain and the cranial base or on the arachnoid membrane, one of the three meningeal layers that cover the brain and the spinal cord.

Excerpt from the Wikipedia article “Arachnoid cyst”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Desherinka, CC BY-SA 3.0, via Wikimedia Commons.