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Arachnoid cyst

Case contributed by: Dr Prashant Gupta

Presentation:

Progressively increasing head size.

Patient Data:

Age: 2yrs
Gender: Female
Race: Indian/Pakistani
From the case: Arachnoid cyst
Modality: MRI

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T1

Large extra-axial cystic lesion in posterior fossa compressing cerebellum consistent with an arachnoid cyst

Case Discussion:

Important points to look for :

  •  is the vermis well formed
  • does the cyst communicate with 4th ventricle. 

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