Journal of neurosurgery
-
Journal of neurosurgery · May 2009
Cisternal segments of the glossopharyngeal, vagus, and accessory nerves: detailed magnetic resonance imaging-demonstrated anatomy and neurovascular relationships.
The aim of this study was to determine whether high-resolution MR imaging is suitable for identifying and differentiating among the nerve root bundles of the glossopharyngeal (cranial nerve [CN] IX), vagus (CN X), and accessory nerves (CN XI) as well as any adjacent vessels. ⋯ The combined use of 3D CISS MR imaging and 3D TOF MR angiography (with or without contrast) successfully displays the detailed anatomy of the lower CNs and adjacent structures in vivo. These imaging sequences have the potential to aid the preoperative diagnosis of and the presurgical planning for pathology in this anatomical area.
-
Journal of neurosurgery · May 2009
Acute vasoconstriction: decrease and recovery of cerebral blood flow after various intensities of experimental subarachnoid hemorrhage in rats.
Immediate vasoconstriction after subarachnoid hemorrhage (SAH) has been observed in a number of experimental studies. However, it has not yet been examined which pattern this acute-type vascular reaction follows and whether it correlates with the intensity of SAH. It was the purpose of the present study to vary the extent of SAH using the endovascular filament model of SAH with increasing filament sizes and to compare the course of intracranial pressure (ICP), cerebral perfusion pressure (CPP), and regional cerebral blood flow (rCBF). ⋯ The disparity between the decline and recovery of CPP and rCBF suggests that acute vasoconstriction occurs even in SAH of a minor extent. Acute vasoconstriction may contribute significantly to a perfusion deficit in the acute stage after SAH. The oscillating pattern of rCBF in the period of early recovery after SAH resembles the pattern of synchronized vasomotion, which has been thoroughly examined for other vascular territories and may yield therapeutic potential.