Arachnoid cyst of the posterior fossa with hydrocephalus

Case contributed by Frank Gaillard

Patient Data

Age: Child

Large posterior cranial fossa CSF intensity space consistent with an arachnoid cyst displaces the cerebellum anteriorly resulting in marked obstructive hydrocephalus. Note the ballooning of the third ventricular recesses and the upward displacement of the corpus callosum. 

Case Discussion

Child with massive obstructive hydrocephalus due to a posterior fossa arachnoid cyst pushing the cerebellum anteriorly and obstructing CSF flow.

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