Presentation
Seizure.
Patient Data
Age: 14 years
Gender: Male
From the case:
Large arachnoid cyst - middle cranial fossa
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Large left middle cranial fossa arachnoid cyst (following CSF on all sequences, no retricted diffusion). It has mass effect on left frontal, temporal lobes and left lateral ventricle.
Case Discussion
Arachnoid cysts are CSF filled cysts, over 50% of which occuring in middle cranial fossa. They are usually asympthomatic but larger ones may cause mass effect related symptoms like seizure, headache, and focal neurologic signs.