✓ In congenital obstructive (internal) hydrocephalus, a coexisting obstruction of the subarachnoid space is frequently present. In the current study, cisternographic evidence is provided that considerable re-expansion of the subarachnoid space may occur after temporary ventricular drainage. These findings suggest that in at least some cases of obstructive hydrocephalus, the subarachnoid space is potentially open but mechanically compressed. The therapeutic significance of re-expanding the subarachnoid space by temporary ventricular shunts is discussed.
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Milhorat et al. (1971) studied this question.
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