Choroidal fissure (diagram)

Case contributed by Dr Angel Donato

Choroidal fissure - normal

Diagram

Normal choroidal fissure. Note its relation with the temporal horn of lateral ventricle and the choroid plexus.

Arachnoid cyst - choroidal fissure origin

Diagram

The choroid plexus is medially displaced in the case of neuroepithelial ventricular origin.

Arachnoid cyst - neuroepithelial ventricular origin

Diagram

The choroid plexus is laterally displaced in the case of cyst of arachnoid origin from the choroidal fissure. 

Case Discussion

Arachnoid cyst represents 1% of all intracranial masses, with the choroidal fissure cyst representing approximately 7.4% of the total.

They can be from the neuroepithelial or arachnoid origin. The choroid plexus is an important landmark to determine its origin from the choroidal fissure or the temporal horn. You will see the choroid plexus laterally displaced in the case of arachnoid origin from choroidal fissure or medially displaced in the case of neuroepithelial ventricular origin. 

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