Arachnoid cyst

Case contributed by Dr Anthony Nuñez


Patient with chronic headache that does not improve with treatment. Receives migraine treatment.

Patient Data

Age: 25 years
Gender: Male

Fluid density extra-axial cyst-like lesion is seen at left middle cranial fossa with remodeling of the adjacent bone (greater wing of sphenoid). Also, produces a mild mass effect over the temporal lobe.

Case Discussion

The Galassi classification is used to classify middle fossa cysts into three types 1.

Type I cysts are typically asymptomatic.

Type II cysts extend superiorly along the Sylvian fissure, occasionally displacing the temporal lobe.

Type III cysts are very large, displacing not only the temporal lobe but also disrupting the parietal and frontal lobes. 

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Case information

rID: 67842
Published: 28th Apr 2019
Last edited: 1st May 2019
Inclusion in quiz mode: Included
Institution: University Institute CEMIC

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