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Posterior fossa cyst demonstrated by isotope cisternography.

posterior fossa, CSF imaging (cisternography) was used in diagnosis, including evaluation of the relationship between the cyst and the CSF space. Although air studies may be equally ef fective in establishing the presence of those intracranial cysts which communicate with the CSF space, cisternography provides more pre cise information regarding the flow pattern of CSF in relation to the cyst. Such information, as illustrated by the case presented here, may be of considerable value in planning surgical management.