http://biblioteca.universia.net/verColeccion.do?start=60&id=4348 Mostrando recursos 61 - 80 de 551 es http://biblioteca.universia.net/img/logotipo.jpg http://biblioteca.universia.net/ http://biblioteca.universia.net/ficha.do?id=16434199 Leonetti, John P. http://biblioteca.universia.net/ficha.do?id=16434200 This study was designed to determine if oral clonidine or lidocaine, injected into the scalp before head-holder (H-H) insertion, would attenuate the hemodynamic effects associated with intubation and H-H placement. Thirty-four patients undergoing skull base procedures were randomized to four groups. Group 1 received clonidine 5 mcg/kg po before surgery with 10 to 15 ml of 1% lidocaine infiltrated at pin insertion sites; Group 2 received clonidine with saline infiltration; Group 3 received a p... Jellish, W. Scott; Theard, M. Angele; Cheng, Mary Ann; Leonetti, John P.; Crowder, C. Michael; Tempelhoff, Rene http://biblioteca.universia.net/ficha.do?id=16434201 We applied a cranio-orbital-zygomatic approach that extends the temporal craniotomy more posteriorly and minimizes the frontal orbitotomy of an ordinary orbitozygomatic approach in order to provide wide access to the already eroded petrous apices along the long axis of trigeminal neurinomas. We treated seven dumbbell-shaped trigeminal neurinomas between 1991 and 1998 (mean follow-up, 38 months; range, 9 to 109 months). The configuration of the tumor mass was assessed on magnetic resonance ima... Chung, Young Seob; Gwak, Ho-Shin; Jung, Hee-Won; Paek, Sun-Ha; Kim, Dong Gyu; Choi, Kil-Soo http://biblioteca.universia.net/ficha.do?id=16434202 Spetzler, Robert F.; Gleeson, Michael http://biblioteca.universia.net/ficha.do?id=16434203 Grady, M. Sean; Judy, Kevin D.; Bigelow, Douglas C.; Sinson, Grant P.; Rostomily, Robert; Winn, H. Richard http://biblioteca.universia.net/ficha.do?id=16434204 The etiology, classification, clinical presentation, complications, and intravascular routes to image and treat carotid-cavernous fistulas percutaneously are described. Endoarterial and transvenous approaches (through the jugular, inferior petrosal, or cavernous veins) are discussed in relation to the etiology, size, and characteristics of the fistulas, as well as in relation to the planned therapeutic approach and its possible complications. Possible outcomes, with particular attention to th... Shownkeen, Harish; Bova, Davide; Origitano, Thomas C.; Petruzzelli, Guy J.; Leonetti, John P. http://biblioteca.universia.net/ficha.do?id=16434205 http://biblioteca.universia.net/ficha.do?id=16434206 Hemifacial spasm is an uncommon disorder manifesting as a unilateral, involuntary, sporadic contraction of the musculature innervated by the seventh cranial nerve. Although debated, the etiology of hemifacial spasm is generally accepted as compression of the facial nerve by vessels of the posterior circulation. Early surgical techniques were ineffective and fraught with morbidity. Over the past 25 years microvascular decompression surgery has allowed the safe and effective treatment of hemifa... Eby, Joseph B.; Cha, Sung Tae; Shahinian, Hrayr K. http://biblioteca.universia.net/ficha.do?id=16434207 Two young adults underwent resection of large hypervascular vestibular schwannomas (acoustic neuromas) via two-stage surgery. The first patient, a 27-year-old woman with hydrocephalus, had a large hypervascular vestibular tumor in the left cerebellopontine angle (CPA) supplied by the left anterior inferior cerebellar artery (AICA) and posterior inferior cerebellar artery (PICA). The second patient, a 34-year-old woman, had a large AICA-supplied hypervascular vestibular tumor in the left CPA t... Abe, Takumi; Izumiyama, Hitoshi; Imaizumi, Youichi; Kobayashi, Shinsuke; Shimazu, Motohiko; Sasaki, Ken; Matsumoto, Kiyoshi; Kushima, Miki http://biblioteca.universia.net/ficha.do?id=16434218 Geniculate ganglion meningiomas are extremely rare lesions—only 14 cases have been reported in the literature. Two new cases of these tumors are described. On computed tomography and magnetic resonance imaging, both lesions appeared centered on the area of the geniculate ganglion, extending to the tympanic cleft and eroding the middle cranial fossa floor. The first case was treated through a middle cranial fossa approach. Because the tumor was so large in the second case, a subtotal petrosect... Falcioni, Maurizio; Piccirillo, Enrico; Taibah, Abdelkader; Sanna, Mario http://biblioteca.universia.net/ficha.do?id=16434219 This study evaluated the surgical results of the anteromedial approach for treatment of orbital lesions in 16 patients. Pre- and postoperatively, all patients underwent a complete physical examination focusing on the head and neck area including a thorough ophthalmologic evaluation, computerized tomography, and magnetic resonance imaging. The surgical approach was limited to a medial orbitotomy in five patients; the remaining 11 patients underwent a medial orbitotomy combined with an external... Deda, Haluk; Ugur, Hasan Çaglar; Yorulmaz, Irfan; Kucuk, Babur http://biblioteca.universia.net/ficha.do?id=16434220 http://biblioteca.universia.net/ficha.do?id=16434221 Lesions situated ventrally and ventrolaterally to the lower brainstem and upper cervical spinal cord test the skills of neurosurgeons. We present our experience with eight such patients who underwent the extreme lateral craniocervical approach. The pathologies encountered include three distal vertebral aneurysms, one prepontine epidermoid, one anterior foramen magnum meningioma, and three high cervical dumbbell neurofibromas. All lesions were treated effectively. Postoperatively, the patients... Kumar, C.V. Ravi; Satyanarayana, Satish; Rao, B. Ravi Mohan; Palur, Ravikanth S. http://biblioteca.universia.net/ficha.do?id=16434222 The interpeduncular cistern is a difficult region to approach through conventional methods due to its deep location and important adjacent neurovascular structures. Therefore, it is usually difficult to expose the region sufficiently. Technical problems associated with various surgical approaches have led to emergence of combined approaches and their modifications (i.e., the removal of the zygomatic arch). In addition, a frontotemporal craniotomy is reported to provide a wide exposure of the ... Deda, Haluk; Ugur, Hasan Çaglar http://biblioteca.universia.net/ficha.do?id=16434223 In a series of 179 cerebellopontine angle (CPA) tumors, the authors present nine cases (5%) that were cochlear nerve neuromas. There were six men and three women (mean age, 51 years). Preoperative magnetic resonance imaging confirmed the diagnosis in one case with a labyrinthine extension and raised suspicions in the other four cases, which were confirmed during surgery. The remaining neuromas were discovered intraoperatively. The mean time between first observation and surgery was 9 months. ... Barbieri, Marco; Bruzzo, Michel; Mora, Renato; Meller, Renaud; Chays, André; Magnan, Jacques http://biblioteca.universia.net/ficha.do?id=16434224 Despite the widespread availability of surgical navigation devices, their use in lateral skull base and temporal bone surgery has been limited. Problems with current systems include difficulty of use and inadequate accuracy. We present a series of cases using the LandmarX™ surgical navigation system as an adjunct for lateral skull base and temporal bone procedures. This infrared emitting diodes (IRED)-driven system has a post that carries the IREDs and bypasses the need to place the patient i... Staecker, Hinrich; O'Malley, Bert W.; Eisenberg, Howard; Yoder, B. Emmerich http://biblioteca.universia.net/ficha.do?id=16434225 The introduction of computer-assisted navigation systems has played a significant role in assuring the integration and consistent intraoperative use of radiological information. We used a frameless stereotactic navigation system to treat 62 patients with a variety of skull base pathologies. The optoelectric appliance uses digital imaging information to locate surgical instruments in the operative area. The aim of this study was to evaluate the clinical accuracy, practicality, and impact of th... Heermann, Ralf; Schwab, Burkard; Issing, Peter R.; Haupt, Cornel; Lenarz, Thomas http://biblioteca.universia.net/ficha.do?id=16434226 Two patients with extra-axial cavernous hemangioma who presented with headache and oculovisual disturbances were investigated with computed tomography and magnetic resonance imaging. The lesions masqueraded as basal meningioma, but this diagnosis was not supported by magnetic resonance spectroscopy in one patient. Cerebral angiography with embolization was indicated in one patient, but embolization was not justified in the other. Both patients underwent a pterional craniotomy. The lesions wer... Kanaan, Imad; Jallu, Ashraf; Alwatban, Jehad; Patay, Zoltan; Hessler, Richard http://biblioteca.universia.net/ficha.do?id=16434227 We managed five patients with large skull base defects complicated by complex infections with microvascular free tissue transfer. The first patient developed an infection, cerebrospinal fluid (CSF) leak, and meningitis after undergoing a translabyrinthine resection of an acoustic neuroma. The second patient had a history of a gunshot wound to the temporal bone, with a large defect and an infected cholesteatoma that caused several episodes of meningitis. The third through the fifth patients ha... Djalilian, Hamid R.; Gapany, Markus; Levine, Samuel C. http://biblioteca.universia.net/ficha.do?id=16434228 The goal of this study was to determine the membranous protection of the abducens nerve in the petroclival region. The petroclival portion of the abducens nerve was studied in ten dissections from five cadaveric head specimens. One of the heads was used for histological sections. Four heads were injected with colored latex for microsurgical dissections. The histological sections were prepared from petroclival dura mater, embedded in paraffin blocks, stained, sectioned in the axial, coronal, a... Ozveren, M. Faik; Uchida, Koichi; Tekdemir, Ibrahim; Cobanoglu, Bengu; Akdemir, Ismail; Kawase, Takeshi; Deda, Haluk