COLLATERAL CIRCULATION IN THE POSTERIOR FOSSA VIA LEPTOMENINGEAL ANASTOMOSES

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Abstract
Collateral circulation in the posterior fossa via leptomeningeal vessels has been described and demonstrated angiographically in a case of basilar artery thrombosis. The patient survived the initial insult and lived for 3 months; during the time repeat angiography did not reveal recanalization of the basilar artery or an increase in the size of collateral vessels. Correlation of collateral flow patterns with expected sparing of certain areas of the brain stem was confirmed at autopsy.

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