http://biblioteca.universia.net/verColeccion.do?id=4348 Mostrando recursos 1 - 20 de 551 es http://biblioteca.universia.net/img/logotipo.jpg http://biblioteca.universia.net/ http://biblioteca.universia.net/ficha.do?id=5313100 The effectiveness of several anatomical and radiological landmarks proposed to determine whether an aneurysm is located intradurally or extradurally is still debated. In anatomical and radiological studies, we examined the relationships of the distal dural ring (DDR) to the internal carotid artery (ICA) and surrounding bony structures to aid in the localization of aneurysms near the DDR. Anatomical relationships were examined by performing dissections on 10 specimens (5 formalin-fixed cadaver... Beretta, Federica; Sepahi, Ali Nader; Zuccarello, Mario; Tomsick, Thomas A.; Keller, Jeffrey T. http://biblioteca.universia.net/ficha.do?id=5313101 We describe a 71-year-old woman who complained of a 1-year history of double vision when looking to the left, numbness over the right cheek, intermittent tinnitus, and gradually increasing unsteadiness when walking. Computed tomography and magnetic resonance imaging revealed a cholesterol granuloma at the right pyramidal apex anterior to the internal auditory canal and a slight compression of the brainstem on the ipsilateral side. For surgical removal we used the transtemporal approach instea... Bockmühl, Ulrike; Khalil, Hisham S.; Draf, Wolfgang http://biblioteca.universia.net/ficha.do?id=5313102 Ameloblastic carcinoma (AC) is an aggressive malignant epithelial odontogenic tumor. It may appear de novo or originate from a pre-existing ameloblastoma or odontogenic cyst. To our knowledge, an AC that originates from the anterior skull base has not been reported before in the English literature. We report a case of an AC that originated from the anterior skull base and invaded the dura of the anterior fossa and discuss its clinical course and treatment. Ozlugedik, Samet; Ozcan, Muge; Basturk, Olca; Deren, Orgun; Kaptanoglu, Erkan; Adanali, Gökhan; Unal, Adnan http://biblioteca.universia.net/ficha.do?id=5313103 A 68-year-old woman with an unusual tumor involving the right orbit presented with painful exophthalmos of the right eye. Excision biopsy of her right eyelid was performed. The specimen showed ductal differentiation with comma-like extensions identical to syringoma. Cellular atypia, an invasive growth pattern, and remarkable perineural invasion led to the diagnosis of syringomatous carcinoma. Magnetic resonance imaging showed that the tumor exhibited maxillary involvement, invading the suprao... Hasegawa, Shingo; Kohmura, Eiji; Ichinose, Akihiro; Tahara, Shinya; Azumi, Atsushi; Ohbayashi, Chiho; Nibu, Ken-ichi http://biblioteca.universia.net/ficha.do?id=5313104 Isolated metastatic tumors to the optic nerve are extremely rare. We describe a rare and unusual case of metastatic breast carcinoma to the optic nerve that mimicked an optic nerve sheath meningioma in its presentation due to its indolent symptom progression, initial radiological appearance, and minimal growth on serial imaging. The patient, a 46-year-old woman with a history of stable metastatic breast carcinoma, presented with progressive visual loss in her right eye over a 6-month interval... Fox, Benjamin; Pacheco, Paulette; DeMonte, Franco http://biblioteca.universia.net/ficha.do?id=5313105 Objectives/Hypothesis: We reviewed our experience with craniofacial resection for advanced, nonmelanoma skin cancer of the head and neck to determine prognostic factors, local control rate, disease free survival, morbidity, and mortality. Backous, D D.; Demonte, F; El-Naggar, A; Wolf, P; Weber, R S. http://biblioteca.universia.net/ficha.do?id=6907110 Objectives: To analyze factors associated with the clinical growth index of sporadic unilateral vestibular schwannoma and to evaluate the validity of the index as an indicator of tumor growth. Design: A retrospective case review study. Patients and methods: A series of 118 patients with unilateral vestibular schwannomas. Clinical growth index was calculated by dividing tumor size by the length of clinical history. Clinical growth index, tumor size, symptoms, and symptom duration were tested f... Diensthuber, Marc; Lenarz, Thomas; Stöver, Timo http://biblioteca.universia.net/ficha.do?id=6907111 Objectives: The traditional approach to sinonasal tumors involving the skull base has been the anterior craniofacial resection. The first report by Ketcham et al (American Journal of Surgery, 1963;106:698–703) documented their experience with 17 anterior craniofacial resections for malignant tumors of the sinonasal tract. Later experience with this technique at several centers has resulted in the publication of many refinements of technique and further reduction in the morbidity and mortality... Castelnuovo, Paolo G.; Belli, Evaristo; Bignami, Maurizio; Battaglia, Paolo; Sberze, Federica; Tomei, Giustino http://biblioteca.universia.net/ficha.do?id=6907112 We evaluated the use of a bypass between the middle meningeal artery (MMA) and P2 segment of the posterior cerebral artery (PCA) as an alternative to an external carotid artery (ECA-to-PCA) anastomosis. Five adult cadaveric heads (10 sides) were used. After a temporal craniotomy and zygomatic arch osteotomy were performed, the dura of the floor of the middle cranial fossa was separated and elevated. The MMA was dissected away from the dura until the foramen spinosum was reached. Intradurally,... Ustun, Mehmet Erkan; Buyukmumcu, Mustafa; Ulku, Cagatay Han; Guney, Önder; Salbacak, Ahmet http://biblioteca.universia.net/ficha.do?id=6907113 Cholesteatomas (central nervous system epidermoids) can be found intradurally or extradurally in the central nervous system. Extradural intraosseous lesions are most commonly found in the petrous bone. The authors describe a unique case of a clival cholesteatoma in a 64-year-old woman who presented with headaches. No other neurological complaints or physical examination findings were noted. Magnetic resonance imaging showed an expansile lesion centered in the middle portion of the clivus. A l... Fassett, Daniel R.; Kan, Peter; Chin, Steven S.; Couldwell, William T. http://biblioteca.universia.net/ficha.do?id=6907114 Objective: Endoscopic repair of cerebrospinal fluid (CSF) leaks is a recognized technique. We consider our experience and evaluate the outcomes in patients who underwent endoscopic repair of CSF leaks. Methods: A retrospective case note review of 135 patients who underwent anterior cranial repairs of CSF leaks between August 1995 and December 2004 at a tertiary referral center. We describe the technical details and outcomes of care by purely endoscopic procedures. Results: Thirteen patients h... Castelnuovo, Paolo G.; Delú, Giovanni; Locatelli, Davide; Padoan, Giovanni; Bernardi, Francesca De; Pistochini, Andrea; Bignami, Maurizio http://biblioteca.universia.net/ficha.do?id=6907115 Objectives: To illustrate endoscopic techniques used in the treatment of esthesioneuroblastoma and to advocate this method of management followed by radiation therapy in selected cases. Methods: A retrospective case series of 10 patients with esthesioneuroblastomas treated between 1999 and 2004 at a tertiary referral center using endonasal techniques. Results: Mean age of patients at presentation was 56.2 years (median 57 years). Seven patients were female and 3 patients were male. Kadish sta... Castelnuovo, Paolo G.; Delù, Giovanni; Sberze, Federica; Pistochini, Andrea; Cambria, Cristhian; Battaglia, Paolo; Bignami, Maurizio http://biblioteca.universia.net/ficha.do?id=6907116 Objective: To demonstrate the flexibility, adaptability, and efficacy of endoscopic endonasal removal of the inferior half of the middle turbinate in a cadaveric study and in surgery for the treatment of different sphenoid sinus and skull base lesions. Methods: Anatomic Cadaveric Study: Five adult cadaveric heads were studied. Six nostrils of 3 cadavers were studied endoscopically after the lower half of the middle turbinate was removed. Two adult cadaveric heads underwent bilateral parasepta... El-Banhawy, Omar A.; El-Dien, Abd El-Hafiz Shehab; Zolfakar, Ahmed Said; Halaka, Ahmed N.; Ayad, Heshmat http://biblioteca.universia.net/ficha.do?id=14344442 In the management of skull base chordomas, surgical treatment is essential to achieve long-term control. A petroclival chordoma growing laterally in the skull base is one of the most challenging tumors for neurosurgeons. We have treated petroclival chordomas based on the principle of maximal surgical resection of the tumor with minimal morbidity. Lateral skull base approaches were used to approach petroclival chordomas in eight patients. The surgical procedure involved removal of soft tumor t... Takami, Toshihiro; Ohata, Kenji; Goto, Takeo; Tsuyuguchi, Naohiro; Nishio, Akimasa; Hara, Mitsuhiro http://biblioteca.universia.net/ficha.do?id=14344443 Objectives: To review the symptoms, signs, and clinical findings in a large series of patients diagnosed with unilateral sporadic vestibular schwannoma (VS) to describe the clinical characteristics of tinnitus in this population. Further, to ascertain which of the proposed mechanisms of tinnitus generation in VS was supported. Design: Retrospective case note and database review. Setting: Tertiary university teaching hospital departments of audiology and neuro-otology. Participants: Nine hundr... Baguley, David M.; Humphriss, Rachel L.; Axon, Patrick R.; Moffat, David A. http://biblioteca.universia.net/ficha.do?id=14344444 Trans-sphenoid anterobasal temporal lobe meningoceles are rare and can be associated with temporal lobe epilepsy or recurrent meningitis. Surgical treatment is described via complicated infratemporal or intracranial approaches with high morbidity. A 32-year-old man presented with an 18-year history of two types of seizures and confirmed epileptic activity in electroencephalogram. A trans-sphenoid meningocele in the left pterygopalatine fossa was found on computed tomography and magnetic reson... Kantas, Ilias; Tzindros, Georgios; Papadopoulou, Anna; Marangos, Nikolaos http://biblioteca.universia.net/ficha.do?id=14344445 Aim of study: To identify those patients with vestibular schwannoma (acoustic neuroma) in whom treatment becomes necessary. Method: Retrospective chart review. Result: A total of 205 patients with small tumors were followed for a mean of 40.8 months. The longest follow-up was 180 months. One hundred and ninety-seven patients had a follow-up of more than 12 months. Eight patients with a follow-up of less than 12 months were excluded from the study. In 136 patients (66.3%) the tumor did not gro... Al Sanosi, Abdulrahman; Fagan, Paul A.; Biggs, Nigel D.W. http://biblioteca.universia.net/ficha.do?id=14344446 Intracranial epidermoid cysts are slow-growing lesions, which may recur after incomplete resection, but do so over many years. The authors present the case of an epidermoid that repeatedly recurred over a short period, which was discovered to be secondary to a low-grade bacterial infection. A 30-year-old woman presented with signs and symptoms related to brainstem and cranial nerve compromise from a large cerebellopontine angle epidermoid cyst. She underwent a subtotal excision of a macroscop... Rutherford, Scott A.; Leach, Paul A.; King, Andrew T. http://biblioteca.universia.net/ficha.do?id=14344447 Objective: Facial nerve paralysis or compromise can be caused by lesions of the temporal bone and cerebellopontine angle and their treatment. When the facial nerve is transected or severely compromised and primary end-to-end repair is not possible, hypoglossal-facial nerve anastomosis remains the most popular method for accomplishing three main goals: restoring facial tone, restoring facial symmetry, and facilitating return of voluntary facial movement. Our objectives are to evaluate the surg... Roland Jr, J. Thomas; Lin, Karen; Klausner, Lee M.; Miller, Philip J. http://biblioteca.universia.net/ficha.do?id=14344448 Five unusual cases of posterior skull base tumors were treated through different skull base approaches. Two or more staged operations were required to achieve total or near-total excision and decompression of two extensive tumors. Total excision of an extensive en plaque meningioma of the foramen magnum that encircled the brain stem and cervical spinal cord could not be achieved through the extreme lateral and suboccipital craniectomy approach. However, the vital structures were decompressed ... Kumar, Raj; Wani, Abrar Ahad