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John D. Heiss, Nicholas Patronas, Hetty L. DeVroom, Thomas Shawker, Robert Ennis, William Kammerer, Alec Eidsath, Thomas Talbot, Jonathan Morris, Eric Eskioglu and Edward H. Oldfield

expulsion of CSF into the cervical subarachnoid space is the normal compensatory mechanism in response to brain expansion during cardiac systole ( Fig. 8 upper ), brain expansion forces the cerebellar tonsils (as shown on intraoperative ultrasound images) into the partially enclosed spinal subarachnoid space ( Fig. 8 center ). Because the partially enclosed spinal subarachnoid space has low compliance to abrupt changes in volume, tonsillar descent results in enlarged cervical subarachnoid pulse pressure waves, as demonstrated by the results of the CSF pressure