Arachnoid cyst - cerebellopontine angle

Case contributed by Bahman Rasuli
Diagnosis certain

Presentation

Headache, nausea, and vomiting.

Patient Data

Age: 15 years
Gender: Male
This study is a stack
Axial
T1
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Axial T2
fat sat
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Coronal
T2
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Coronal
T1
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Axial
FIESTA
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Axial T1
C+ fat sat
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Coronal T1
C+ fat sat
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Axial
DWI
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Axial
ADC
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Info

There is a well-circumscribed CSF intensity lesion within the right cerebellopontine angle with indentation of the medulla, middle cerebellar peduncle, and vestibulocochlear nerve. Content follows CSF on all sequences including diffusion-weighted imaging. No abnormal enhancement. The seventh and eighth cranial nerves are displaced superiorly. The ventricles are unremarkable in appearance with no evidence of hydrocephalus.

Case Discussion

The features, in this case, 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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