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The space left after an arachnoid cyst drainage!  

As discussed in the previous post, treatment may be necessary when symptomatic. Options include a cystoperitoneal shunt that drains the CSF to the peritoneal cavity, or craniotomy with excision, or a needle aspiration. Nowadays, various endoscopic techniques are also used to cause less invasion and damage. This is the huge space that was left under the dura mater following a complete removal of the arachnoid cyst.