Presentation
Follow up of left middle cranial fossa arachnoid cyst. Increasing headache.
Patient Data
Age: 35 years
Gender: Female
From the case:
Idiopathic intracranial hypertension
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Partially empty sella and symmetrically dilated Meckel cave bilaterally. Dilated perioptic nerve CSF spaces, with vertical tortuosity of optic nerves and flattening of the optic nerve heads.
Enlarged CSF space around the third cranial nerve in the cavernous sinus bilaterally.
Incidental left middle cranial fossa arachnoid cyst.
Case Discussion
This case demonstrates some of the key features of idiopathic intracranial hypertension (IIH):
- dilated CSF spaces around the optic nerves
- empty sella
- dilated Meckel cave
Other MRI features not present on this MRI that support IIH include "pinched" transverse sinuses and increased scalp/nuchal subcutaneous fat.
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