Intraoperative ventricular puncture.

Modern neuroanesthetic techniques frequently provide the neurosurgeon with adequate brain relaxation for an atraumatic frontotemporal or transylvian dissection. Circumstances such as recent subarachnoid hemorrhage with brain edema and acute hydrocephalus can mandate significant frontal lobe retraction before access to cerebrospinal fluid (CSF) drainage from the basal cisterns is gained. A simple technique can give the "early" aneurysm surgeon reliable access to the frontal horn of the lateral ventricle for intraoperative drainage of CSF before brain retraction.