Presentation
One week history of Headaches and nausea. No history of trauma.
Patient Data
There is an extra-axial cystic lesion of CSF signal on all sequences, filling the middle cranial fossa and extending along the Sylvian fissure with thinning of the adjacent bones and mass effect with displacement of temporal and frontal lobes. Note a left hemispheric crescent-shaped fluid collection of CSF signal within the subdural space (subdural hygroma) with no midline shift.
Case Discussion
MRI features of an arachnoid cyst of the middle cranial fossa type III (Galassi classification) ruptured into the subdural space, causing a subdural hygroma.
Arachnoid cysts within the brain are common in children but its rupture within the subdural space is relatively rare. It's usually the result of a tear of the arachnoid membrane (due to trauma, surgical manipulation, or rarely spontaneous) with an accumulation of CSF fluid within the subdural space.
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