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Origins of Wilder Penfield's surgical technique

The role of the “Cushing ritual” and influences from the European experience

Mark C. Preul and William Feindel

craniotomy. Arch Neurol Psychiatry 35 : 1 – 12 , 1936 Cone W, Penfield W: Subtemporal and suboccipital myoplastic craniotomy. Arch Neurol Psychiatry 35: 1–12, 1936 2. Cushing H : Psychiatrists, neurologists and the neurosurgeon , in: Neurological Biographies and Addresses; Foundation Volume Published for the Staff, to Commemorate the Opening of the Montreal Neurological Institute of McGill University [on 27th September, 1934.] London : Oxford University Press , 1936 , pp 17 – 36 Cushing H: Psychiatrists

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Percutaneous trigeminal ganglion compression for trigeminal neuralgia

Experience in 22 patients and review of the literature

Jeffrey A. Brown and Mark C. Preul

inflated to a volume of 0.75 cc. The mean pressure of tissue compression was thus 499 mm Hg. The balloon inflation pressure was also measured in seven fresh cadavers. The needle and balloon were positioned under fluoroscopic guidance, similar to the technique used in patients. Mean in vivo pressure was 1266 ± 80 mm Hg. Thus, the mean pressure of tissue compression was 766 mm Hg. Review of the balloon location in these cadavers showed that the radiographic “pear shape” occurs because of extension of the tip of the fully inflated balloon into the more slender porus

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Mark C. Preul and William Feindel

. 26th March 1934 Dear Dr. Cushing: We are planning to have the opening exercises of the Montreal Neurological Institute early in October next and we are all of us very anxious to have you give an address on that occasion. We cannot start this work in neurology and neurosurgery without your blessing. … You could, of course, choose any subject on which to speak, but we would be very much pleased if you would look into the future or the past of neurology a little. We are planning to publish a small volume to commemorate the opening of the Institute and would

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John H. Sampson and Jenny K. Hoang

Sankar et al. 15 retrospectively review their single-institution experience with oliogodendrogliomas that enhance preoperatively to determine if the amount of postoperative residual enhancing volume has prognostic importance. They use a semiautomated, free software tool that provides quantitative volumetric measurements of residual enhancing volume and demonstrate enviable intra- and interobserver reliability. Their analysis shows that reduced postoperative residual enhancing volume and a greater resection of enhancing tissue are associated with longer

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Celeste R. Brennecka, Mark C. Preul, Timothy A. Becker and Brent L. Vernon

T he use of liquid embolics for noninvasive cerebral aneurysm embolization has slowly gained clinical familiarity over the last decade with the emergence of Onyx (ev3, Inc.), a precipitating copolymer system composed of ethylene vinyl alcohol. The endovascular delivery of platinum coils is still considered to be the “gold standard” of noninvasive cerebral aneurysm treatment. However, because < 35% of an aneurysm's volume can be occluded with coils 7 , 30 , 41 , 43 and the remaining volume is occupied by a forming blood clot, this coil-clot complex tends

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Mark C. Preul, Patrick K. Campbell, David S. Garlick and Robert F. Spetzler

. Two methods of application of this hydrogel were also assessed. Optimal delivery of such hydrogels requires investigations of mode of application in terms of speed of application, accuracy, aerosolization, and thickness of coat. To determine if volume or method of application of the hydrogel was of significance, we used a conventional 2-chamber syringe sprayer (Dual Liquid applicator) driven by hand pressure on the dual syringes, and a gas-assisted sprayer (MicroMyst applicator) designed to improve the control of application in areas of limited access. Methods

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Mark C. Preul, Joseph Stratford, Gilles Bertrand and William Feindel

highlights. J Clin Neurophysiol 9 : 176 – 194 , 1992 Feindel W: Brain physiology at the Montreal Neurological Institute: some historical highlights. J Clin Neurophysiol 9: 176–194, 1992 18. Feindel W : Cone, William Vernon, 1897–1959 , in Alexander E (ed): The Society of Neurological Surgeons Diamond Jubilee Volume. Winston-Salem, NC : Hunter , 1984 , p 50 Feindel W: Cone, William Vernon, 1897–1959, in Alexander E (ed): The Society of Neurological Surgeons Diamond Jubilee Volume. Winston-Salem, NC

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Daniel D. Cavalcanti, Mark C. Preul, M. Yashar S. Kalani and Robert F. Spetzler

. Lesions surfacing anteriorly on the peduncle, pontomesencephalic junction, or upper pons can be managed through these approaches. The anterior mesencephalic zone can also be nicely exposed when neither color nor volume alteration is visible on the pial surface. We currently use keyhole approaches rather than extensive dissections and large craniotomies whenever possible. The mini-modified orbitozygomatic (mini-OZ) approach generally replaces full orbitozygomatic craniotomies. The mini-OZ requires a significantly smaller skin incision, just behind the hairline, and the

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Robert W. Ryan, Robert F. Spetzler and Mark C. Preul

Investigators also began to take advantage of the fundamental properties of different types of lasers. The long wavelength of the CO 2 laser (10.6 μm) was found to have high absorption in tissue and water, with rapid conversion of light energy into heat in a small volume of tissue. 16 This profile makes the CO 2 laser an excellent cutting tool, as it causes minimal thermal damage to adjacent tissue but limits its ability to coagulate large vessels. Extensive experiments on the lesion characteristics produced by CO 2 laser beams were conducted by Stellar et al. 32 and

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Mark C. Preul, Patrick K. Campbell, William D. Bichard and Robert F. Spetzler

, including those based on PEG and other compounds, are well known to swell when exposed to water or other fluids, and thus care must be taken to apply them in a fashion consistent with their design and where space may allow for potential increase in their volume. The hydrogel in this study was effective at thin layer applications (average of 2 mm). Hydrogels in development will offer minimal degrees of swelling while preserving effect. Clinical comparisons of these new biomaterials will be needed. Nonetheless, advantages such as biocompatibility, decreased neurotoxicity