Idiopathic intracranial hypertension
Follow up of left middle cranial fossa arachnoid cyst. Increasing headache.
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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.
This case demonstrates some of the key features of idiopathic intracranial hypertension (IIH):
Other MRI features not present on this MRI that support IIH include "pinched" transverse sinuses and increased scalp/nuchal subcutaneous fat.
- Suzuki H, Takanashi J, Kobayashi K et-al. MR imaging of idiopathic intracranial hypertension. AJNR Am J Neuroradiol. 2001;22 (1): 196-9. AJNR Am J Neuroradiol
- Schuknecht B, Simmen D, Briner HR et-al. Nontraumatic skull base defects with spontaneous CSF rhinorrhea and arachnoid herniation: imaging findings and correlation with endoscopic sinus surgery in 27 patients. AJNR Am J Neuroradiol. 2008;29 (3): 542-9. doi:10.3174/ajnr.A0840