Presentation
Right trigeminal neuralgia
Patient Data
Age: 45 years
Gender: Female
From the case:
Epidermoid cyst compressing the trigeminal nerve
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An extra-axial mass of irregular margins is seen in the right cerebellopontine angle (CPA), compressing the brainstem, homolateral trigeminal nerve as well as the right middle cerebellar peduncle. It shows low signal on T1, heterogeneous signal on FLAIR and high signal on T2 with no enhancement seen on postcontrast sequences. It appears of high signal on DWI (restricted diffusion).
Case Discussion
Typical MRI appearances of a cerebellopontine angle epidermoid cyst
DWI is important to differentiate epidermoid cyst from an arachnoid cyst.
In the case of an arachnoid cyst DWI shows a low signal as the CSF.
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