Presentation
Right hemiparesis
Patient Data
Age: 15 years
Gender: Female
From the case:
Arachnoid cyst - middle cranial fossa
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A large extra-axial cystic structure of CSF signal is seen on all sequences, filling the whole left middle cranial fossa, extending superiorly along the Sylvian fissure. Note how pulsation fo the internal carotid results in turbulent flow in the cyst with signal loss on T2 (best seen on coronal images). Mass effect is noted on the frontal and temporal lobes as well as the midline structures. Remodeling and thinning of the adjacent bone are noted. No restricted diffusion is seen on DWI/ADC.
Case Discussion
MRI features of an arachnoid cyst of the middle cranial fossa type III according to The Galassi classification of middle cranial fossa arachnoid cysts
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