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Galassi classification


Arachnoid cysts


Type I


Small, spindle shaped, limited to anterior middle cranial fossa, usually with free communication of CT cisternography.











Type II


Superior extent along sylvian fissure with displacement of the temporal lobe.
















Type III


Large, fills the whole middle cranial fossa, with displacement of not only the temporal lobe but also the frontal and parietal lobes.Little communication with subarachnoid space on CT cisternography.









Reference


Radiopaedia.org

         QUISTE ARACNOIDEO TIPO   I.

QUISTE ARACNOIDEO TIPO  II.

QUISTE ARACNOIDEO TIPO III.

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