Fenestration of the lamina terminalis (LT) is an alternative means of cerebrospinal fluid (CSF) drainage during acute or emergency surgery of ruptured intracranial aneurysms in patients with high-grade subarachnoid hemorrhage. External ventricular drainage allows drainage of CSF and also measurement of intracranial pressure after the surgery. Catheterization of the third ventricle via the fenestrated LT after clipping the aneurysm is an alternative to conventional ventriculostomies. This method has been used by the senior author (JAH) since 2001. The authors describe their experience with this technique, which can be used safely in selected cases of high-grade subarachnoid hemorrhage.
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