Presentation
Irritable child
Patient Data
Age: 5 years
Gender: Male
From the case:
Arachnoid cyst-posterior fossa
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A well-defined rounded cystic structure posteroinferior to vermis with no communication to the fourth ventricle. Dilatation of third and both lateral ventricles with subependymal leakage ( acute tri-ventricular hydrocephalus)
Case Discussion
An intact vermis and lack of communication with the fourth ventricle are features of a posterior fossa arachnoid cyst
Additional contributor: Dr. Rasool Noori
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