external hydrocephalus

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ex·ter·nal hy·dro·ceph·a·lus

1. accumulation of fluid in the subarachnoid spaces of the brain;
2. accumulation of fluid in the subdural space owing to a persistent communication between the subarachnoid and subdural spaces.
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benign external hydrocephalus

A condition that occurs in infancy and early childhood, which is characterised by enlargement of the subarachnoid space, typically in the frontal areas and interhemispheric fissure with raised intracranial pressure without significantly enlarged ventricles. It is attributed to an absorption deficiency and typically resolves within a year.
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external hydrocephalus

An accumulation of fluid in subdural spaces.
See also: hydrocephalus
Medical Dictionary, © 2009 Farlex and Partners