Presentation
Headaches.
Patient Data
Age: 20 years
Gender: Female
From the case:
Arachnoid cyst - middle cranial fossa
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Large extra-axial cystic lesion in the left middle cranial fossa, extending to the insular region, eliciting a CSF signal on all sequences with no restricted diffusion. It compresses and displaces the temporal and frontal lobes with thinning of the adjacent inner table of the skull. A mass effect is noted on the midline structures.
Case Discussion
MRI features of a large arachnoid cyst of the middle cranial fossa extending to the insular region, type III according to Galassi classification.
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