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.
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.
- Robertson SJ, Wolpert SM, Runge VM. MR imaging of middle cranial fossa arachnoid cysts: temporal lobe agenesis syndrome revisited. (1989) AJNR. American journal of neuroradiology. 10 (5): 1007-10. Pubmed