Last Updated on Apr 28, 2015


Cyst It is a closed tissue that may contain pus, air, fluid, or other material.

Arachnoid membrane It is one of the 3 membranes that protects the brain and spinal cord.

Intradural Located between or within the dura mater (the outermost membrane of the brain).

Extradural Located outside the dura mater.

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