Presentation
Vertigo.
Patient Data
Age: 13 years
Gender: Male
From the case:
Arachnoid cyst - cerebellopontine angle
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There is a 15 x 23 mm well-circumscribed CSF intensity lesion at the right cerebellopontine angle following the CSF signal on all sequences including diffusion-weighted imaging.
The seventh and eighth cranial nerves are displaced superiorly.
No solid elements. No obvious mass effect on the pons.
The ventricles are unremarkable in appearance with no evidence of a hydrocephalus.
The remainder of the intracranial appearances are normal.
Case Discussion
Imaging features are pathognomonic of an arachnoid cyst, in a typical location for an epidermoid cyst. The absence of any significant diffusion restriction confirms the diagnosis.
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