Arachnoid cyst - middle cranial fossa
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Large cystic lesion of extra-axial location in the left middle cranial fossa, extending to the insular region. It displays an isosignal to the CSF signal on T1 and T2 sequences with no restricted diffusion. It compresses the temporal and frontal lobes with thinning of the adjacent inner table of the skull. No significant mass effect on the midline structures.
Peritrigonal areas of high signal on T2 sequences suggestive of terminal zones of myelination.