Arachnoid cyst - middle cranial fossa

Case contributed by Ammar Haouimi


Incidental finding.

Patient Data

Age: 20 years
Gender: Female

There is an extra-axial cyst (36 x 34 x 28 mm) of CSF signal on all sequences, filling the left middle cranial fossa, and displacing the temporal lobe. No restricted diffusion is seen on DWI/ADC.


Case Discussion

 MRI Features are characteristic of an arachnoid cyst type II according to Galassi classification of middle cranial fossa arachnoid cysts.

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