PubMed Central (PMC3 - NLM DTD)
(2,081,148 recursos)
Archive of life sciences journal literature at the U.S. National Institutes of Health (NIH), developed and managed by NIH's National Center for Biotechnology Information (NCBI) in the National Library of Medicine (NLM).
Mostrando recursos 121 - 140 de 551
121.
Solitary Schwannoma of the Olfactory Groove: Case Report and Review of the Literature - Carron, Jeffrey D.; Singh, Ran Vijai P.; Karakla, Daniel W.; Silverberg, Marc
Schwannomas of the olfactory groove are rare tumors. Only 10 have been reported in the past century. The case of a 59-year-old woman with an isolated olfactory schwannoma with cribriform plate erosion is presented.
122.
Commentary - Casey, Kenneth F.; Jannetta, Peter J.
124.
Comparison of the Exposure Obtained by Endoscope and Microscope in the Extended Trans-Sphenoidal Approach - Batay, Funda; Vural, Emre; Karasu, Aykut; Al-Mefty, Ossama
Objective: Trans-sphenoidal surgery is often combined with other approaches for the treatment of middle cranial base tumors. By combining a maxillotomy with trans-sphenoidal approach, significantly wider exposure to these regions is gained. However, endoscope-assisted techniques have also been used for sellar and parasellar and upper clival regions. Methods: An extended trans-sphenoidal approach was performed on 10 cadaver heads using the operating microscope and was repeated with a 0-degree endoscope. The mean horizontal and vertical distances were measured and pictured for each technique, and both distances were compared using a parametric paired Student's t-test. Results: The mean horizontal distances in the...
125.
Postmastoidectomy Pneumocephalus: Case Report - Dubey, Siba P.; Jacob, Ollapalili; Gandhi, Mitesh
Chronic otitis media, unlike trauma, seldom leads to the development of tension pneumocephalus. Rarely, it occurs as a complication of mastoid surgery. A Melanesian woman sought treatment for loss of speech, hemiparesis, and headache 4 weeks after undergoing canal-down mastoidectomy for cholesteatoma. The tension pneumocephalus was decompressed urgently by aspirating air via a cannula through the burr hole, and the mastoid cavity was obliterated. She recovered completely. Twelve additional patients with postmastoidectomy pneumocephalus reported in the literature are reviewed.
127.
Transmastoid Repair of Minor Skull Base Defects with Flexible Hydroxyapatite Sheets - Zanetti, Diego; Nassif, Nader
This prospective open pilot study was designed to assess the suitability of flexible composite sheets of polymer and hydroxyapatite (HA) for the reconstruction of limited lateral skull base defects through a conservative transmastoid approach.
128.
Clinical and Histologic Parameters Correlated with Facial Nerve Function After Vestibular Schwannoma Surgery - Couloigner, Vincent; Gervaz, Elena; Kalamarides, Michel; Ferrary, Evelyne; Rey, Alain; Sterkers, Olivier; Hénin, Dominique
This study was conducted to identify clinical and histologic factors that would influence, independently of tumor staging, postoperative facial function after removal of a vestibular schwannoma. A prospective study was performed on 35 consecutive patients with vestibular schwannomas who underwent the translabyrinthine approach. Facial function was assessed before and 1 year after surgery. The factors that influenced the postoperative outcome of the facial function independently of tumor staging were the absence or the desynchronization of homolateral auditory brainstem responses and tumor edema. Other factors (audiovestibular signs of brainstem compression, tumor inflammation, positive p53 protein immunostaining) were predictive of postoperative facial...
129.
Intraoperative ImageGuided Surgery of the Lateral and Anterior Skull Base in Patients with Tumors or Trauma - Wiltfang, Joerg; Rupprecht, Stephan; Ganslandt, Oliver; Nimsky, Christopher; Keßler, Peter; SchultzeMosgau, Stefan; Fahlbusch, Rudolf; Neukam, Friedrich Wilhelm
The aim of this investigation was to evaluate the suitability and usefulness of the Stealth Station intraoperative guiding system (Medtronic Sofamor Danek, Memphis, TN) in a variety of indications. Eleven intraoperative imageguided procedures were performed for anterior or lateral skull base lesions. The most common neurosurgical approaches included frontal, coronal, and parietotemporal access. Neuronavigation reliably allowed the extent of tumor configuration and risk zones (e.g., blood vessels) to be visualized. Thus, gross tumor resection was achieved in 6 of 7 patients and facilitated reconstruction by the maxillofacial surgeon, resulting in radiologically symmetrical and clinically satisfying results. Postoperatively, one patient was...
130.
Paraclinoid Carotid Aneurysms: Surgical Management, Complications, and Outcome Based on a New Classification Scheme - Barami, Kaveh; Hernandez, Vladimir S.; Diaz, Fernando G.; Guthikonda, Murali
The site of origin, projection, and relationship of aneurysms arising from the ophthalmic segment of the internal carotid artery (ICA) to adjacent structures are heterogeneous. Based on a retrospective analysis of 61 patients with aneurysms in this location, we developed a simple numerical classification system to guide surgical planning. We used angiographic findings to categorize the aneurysms. We followed the nomenclature of the carotid segments by Bouthillier et al (Neurosurgery 1996;38:425432), C4 being the intracavernous ICA, C5 the clinoidal segment, and C6 the ophthalmic segment of the ICA. The aneurysms were divided into four major types: Types Ia and Ib...
131.
Comparison of Different ComputerAided Surgery Systems in Skull Base Surgery - Ecke, U.; Luebben, B.; Maurer, J.; Boor, S.; Mann, W. J.
Computeraided surgery (CAS) based on highresolution imaging techniques represents an important adjunct to precise intraoperative orientation when anatomical landmarks are distorted or missing. Several commercial systems, mostly based on optical or electromagnetic navigation principles, are on the market. This study investigated the application of EasyGuide®, VectorVision®, and InstaTrak® CAS systems in ENT surgery under practical and laboratory conditions. System accuracy, time required, handling, individual features, and practicality were examined in 155 patients who underwent endonasal sinus surgery and in 23 patients who underwent anterior or lateral skull base procedures. The VectorVision® and InstaTrak® CAS systems proved to be suitable for...
132.
Recurrent Rhabdoid Meningioma: Case Report - Jansen, Jeroen C.; Turner, Jenny; Sheehy, John; Fagan, Paul A.
Most meningiomas are slowgrowing tumors that do not rapidly recur after subtotal removal. After subtotal resection of a meningioma a 47yearold woman developed a large extracranial recurrence 1 year later. The recurrence was resected successfully. On histological examination the typical characteristics of a meningioma were absent. Based on immunohistological and ultrastructural studies, the tumor was classified as a grade III meningioma of the newly recognized rhabdoid subtype.
133.
Craniopharyngioma - Laws, Edward R.; Weiss, Martin H.; White, William L.
135.
Comparison of Mandibular Surgical Techniques for Accessing Cranial Base Vascular Lesions - Devlin, Michael A.; Hoffmann, Keith D.; Johnson, Walter D.
This study compared mandibular distraction and vertical ramus osteotomy in terms of their effectiveness at increasing access to the cranial base and distal internal carotid artery. Five freshfrozen cadavers were used to obtain a total of ten cranial base exposures. The following two techniques were evaluated on each of the ten exposures: (1) anterior distraction of the mandible without violation of the temporomandibular joint capsule, and (2) vertical ramus osteotomy of the mandible with distraction of the proximal and distal segment. The neutrally positioned mandible with the condyle seated in the glenoid fossa served as the control. The area of...
136.
Neuroendoscopic Transnasal Repair of Cerebrospinal Fluid Rhinorrhea - Husain, Mazhar; Jha, Deepak; Vatsal, Devendra K.; Husain, Nuzhat; Gupta, Rakesh K.
Cerebrospinal fluid (CSF) rhinorrhea is a common condition managed by most otolaryngologists with the help of nasal endoscopy (sinoscopy). In the last 2 years, we have used a neuroendoscope with a working sheath to treat nine patients with CSF rhinorrhea. One patient developed a recurrence 1 month after treatment but then responded to conservative treatment. We conclude that the treatment of CSF rhinorrhea by a neuroendoscope with a working sheath is safe, effective, and easy and obviates the need for a separate sinoscope.
137.
Osteosarcoma of the Skull Base after Radiation Therapy in a Patient with McCuneAlbright Syndrome: Case Report - Hansen, Marlan R.; Moffat, J. Craig
Sarcomas of the skull base occurring in the field of prior radiotherapy are rare; only a few have been reported in the English literature. We report a fatal osteosarcoma of the skull base arising in a patient with McCuneAlbright syndrome and severe fibrous dysplasia of the skull base 22 years after radiation therapy for a pituitary adenoma. This malignancy fulfills Cahan's criteria for a radiationinduced tumor in that it arose in the radiation field of a pituitary adenoma with a latency of 22 years. The literature on radiationinduced sarcomas of the skull base is reviewed, and the predisposition of patients...
138.
Lateral Transmandibular Approach to the Skull Base in Children: Three Case Reports - Kuettner, Christian; Samii, M.; Hausamen, J. E.
The choice of surgical approach to tumors of the cranial base in children is determined by strict criteria. The criteria include optimal visibility for the surgeon, minimal possible impairment of facial skull growth, and the preservation of motor and sensory nerve integrity. From 1993 to 1996, three children (6 years old, 22 months old, 6 months old, respectively) underwent surgery to resect cranial base tumors through a modified lateral transmandibular approach. In all three patients a preauricular incision with temporal and submandibular extensions was performed. After the mandible was prepared, an osteotomy was conducted cranially to the mandibular foramen. When...
139.
Sclerosing Cavernous Hemangioma in the Cavernous Sinus: Case Report - Aversa do Souto, Antonio; Marcondes, Jorge; Reis da Silva, Marcello; Chimelli, Leila
Cavernous hemangiomas of the cavernous sinus belong to a welldistinguished entity of extraaxial cavernous hemangiomas located in the cavernous sinus and have a typical appearance on magnetic resonance imaging (MRI). Severe intraoperative bleeding has been described during the excision of these lesions that is probably associated with their pathological features. An atypical case of a sclerosing lesion with distinct MRI features is described. In these particular cases, especially with giant hemangiomas where en bloc excision would be difficult, safe internal decompression and resection can be achieved.
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