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 181 - 200 de 551
181.
Distal Anterior Inferior Cerebellar Artery Aneurysm Masquerading as a Cerebellopontine Angle Tumor: Case Report and Review of Literature - Sarkar, Atom; Link, Michael J.
We present the case of a distal anterior inferior cerebellar artery (AICA) aneurysm masquerading as a cerebellopontine angle tumor in a 60-year-old right-handed man with previously undiagnosed polyarteritis nodosa (PAN). The patient presented with a 2-month history of progressive right-sided hearing loss, intermittent severe headache, and sudden onset of complete facial paralysis 3 weeks before admission. Magnetic resonance imaging, including postgadolinium images, showed a 1.2-cm heterogenously enhancing mass that slightly enlarged the right internal auditory canal. A right suboccipital craniotomy was performed, and a partially thrombosed fusiform AICA aneurysm was discovered just anterior to the VII/VIII nerve complex. The aneurysm...
182.
Malignant Peripheral Nerve Sheath Tumor of the Orbit: Case Report and Literature Review - Aydin, Mehmet D.; Yildirim, Umran; Gundogdu, Cemal; Dursun, Osman; Uysal, Hasan H.; Ozdikici, Mete
A 68-year-old woman with progressive visual loss and exophthalmos in her right eye had been operated on for a mass in her right calf 3 years earlier. Imaging showed a huge mass invading the orbital structures and temporal pole. The presumptive diagnosis was a malignant orbital tumor. The tumor was resected totally and eroded tissues such as the lateral rectus muscle and dural compartments were repaired. The histological diagnosis was a malignant peripheral nerve sheath tumor (MPNST). The patient recovered uneventfully and was discharged 8 days after surgery. Two years later she died from a liver tumor. Few MPNSTs involving...
183.
Facial Nerve Neuroma: Clinical, Diagnostic, and Surgical Features - Kirazli, Tayfun; Öner, Kazim; Bilgen, Cem; Övül, Izzet; Midilli, Ra?it
Facial nerve neuromas are uncommon benign tumors. The diversity of tumor locations and their proximity to vital neurovascular structures create a variety of clinical situations, and the management strategy for each case differs. Two cases with tumors located at different sites and associated with different clinical presentations are discussed in terms of diagnosis and management.
184.
Parapharyngeal Lipoma Extending to Skull Base: A Case Report and Review of the Literature - Ulku, Cagatay Han; Uyar, Yavuz
Lipomas in the head and neck region usually occur in the immediate subcutaneous tissue. They are extremely rare in the parapharyngeal space. A rare case of a right parapharyngeal space lipoma extending to skull base in an 18-year-old male is reported. The literature is reviewed and the characteristics of disease are discussed.
186.
Quantification of the Advantages of the Extended Frontal Approach to Skull Base - Acharya, Rajesh; Shaya, Mark; Kumar, Ravi; Caldito, Gloria C.; Nanda, Anil
This anatomic study evaluated the extent that a fronto-orbital osteotomy (FOO) added to a bilateral frontal craniotomy widened the exposure to the midline compartment of the anterior, middle, and posterior cranial fossae. The goal was to determine if osteotomy would significantly increase angles for two targets: the foramen magnum (FM) and anterior clinoid process (ACP). Stepwise dissections were performed on five cadaveric heads. A bilateral frontal craniotomy was made, followed by FOO. After the ethmoids were removed, the planum sphenoidale was drilled to enter the sphenoid sinus. Further drilling exposed the anterior clivus, which was drilled down to FM. Excellent...
187.
Preauricular Infratemporal Fossa Surgical Approach: Modifications of the Technique and Surgical Indications - Mansour, Ossama I.; Carrau, Ricardo L.; Snyderman, Carl H.; Kassam, Amin B.
A retrospective clinical analysis was performed to evaluate the effectiveness of the preauricular infratemporal fossa (ITF) surgical approach using modifications based on tumor pathology and extension, without compromising outcomes. Patients were surgically treated for tumors involving the ITF via a preauricular surgical approach during 1990 to 2000. Their clinical charts were reviewed to determine the association among pathological variables, details of the surgical procedure, and outcomes. Tumors in 65 patients were categorized as malignant and benign. The malignant group included 44 patients (mean age, 49.5 years). Squamous cell carcinoma was the most common pathology followed by sarcomas. To achieve complete...
188.
Possibility of Middle Meningeal Artery-to-Petrous Internal Carotid Artery Bypass: An Anatomic Study - Üstün, Mehmet Erkan; Büyükmumcu, Mustafa; ?eker, Muzaffer; Karabulut, Ahmet Ka?an; Uysal, ?smihan ?lknur; Ziylan, Taner
The possibility of creating a middle meningeal artery (MMA)-to-petrous internal carotid artery (ICA) bypass was investigated in six cadavers (bilaterally). Such a procedure could be used to treat patients with high cervical vascular lesions and those with tumors of the infratemporal fossa invading the high cervical ICA. After a frontotemporal craniotomy, the foramen spinosum and foramen ovale were exposed extradurally. Immediately posterior to the foramen ovale and medial to the foramen spinosum, the petrous portion of the ICA was exposed with a diamond-tipped drill. The MMA was lifted from its groove, and a sufficient length was transected to perform a...
189.
Combined HRCT and MRI in the Detection of CSF Rhinorrhea - Mostafa, Badr Eldin; Khafagi, Ahmed
Cerebrospinal fluid (CSF) rhinorrhea is a potentially dangerous problem. Accurate preoperative localization of the site of leakage is mandatory. The standard diagnostic technique is computed tomography (CT) cisternography. Because of its related risks, however, various alternatives have been suggested. High-resolution CT (HRCT) provides good bony details, but fluid is poorly detected. In contrast, T2-weighted magnetic resonance imaging (MRI) shows CSF as a bright signal, but spatial resolution is poor as is the depiction of bony details. To overcome the shortcomings of both techniques, we superimposed the images obtained from each modality and used the result to plan surgical explorations. The...
190.
Sellar-Parasellar Brown Tumor: Case Report and Review of Literature - Yilmazlar, Selcuk; Arslan, Erhan; Aksoy, Kaya; Tolunay, Sahsene
Brown tumors are the end stage of primary or secondary hyperparathyroidism. Such lesions are rare because hyperparathyroidism is now usually diagnosed and treated before they develop. Skeletal bone is most frequently involved, whereas sellar-parasellar involvement is extremely rare. We report a patient with a brown tumor involving the sellar-parasellar region associated with primary hyperparathyroidism. The patient's clinical history and biochemical and radiological tests were used for the diagnosis. Excision of the sellar-parasellar mass enabled histopathological confirmation and surgical decompression of neural structures. After the transsphenoidal surgery, excision of a parathyroid adenoma normalized the patient's metabolic status. Brown tumors are rarely...
191.
Anterior Communicating Artery Aneurysm Following Radiation Therapy for Optic Glioma: Report of a Case and Review of the Literature - Yucesoy, Kemal; Feiz-Erfan, Iman; Spetzler, Robert F.; Han, Patrick P.; Coons, Stephen
A 42-year-old female presented with subarachnoid hemorrhage (SAH), presumably from a radiation-induced anterior communicating artery aneurysm. Six years earlier, she had undergone radiation treatment for an optic glioma that was diagnosed based on imaging criteria. The aneurysm was successfully clipped, and the optic glioma was biopsied to verify the diagnosis histologically. Radiation-induced cerebral aneurysms often manifest with a fatal SAH. These aneurysms typically develop in the field of radiation and are diagnosed a mean of 8.52 years after radiation. Rarely, the aneurysm sac thromboses spontaneously. Clipping or coiling of the aneurysm can be an effective treatment.
192.
Skull base surgery program of the Republic of Cuba: Establishing a Demanding Subspecialty in a Developing Country - Spallone, Aldo
The history of the founding of the Cuban Skull Base Surgery Group is reported. Under the author's supervision and coordination, the group has managed more than 100 major skull base cases over a 6-year period. The mortality rate was 13% and the rate of permanent morbidity was 23%. In the last 2 years, the mortality rate decreased to 8%. These results reflect the group's enthusiasm pitted against the obvious challenges associated with economic constraints. The present experience may be instructive for neurosurgeons interested in exporting their expertise, with the goal of helping colleagues in developing countries to broaden their professional...
194.
Application of CT Angiography of Complex Cerebrovascular Lesions during Surgical Decision Making - Chen, Ying; Manness, Wayne; Kattner, Keith
Helical computed tomographic angiography (CTA) is a relatively new noninvasive volumetric imaging technique. Since early reports in the 1990s, CTA has rapidly improved image resolution and scan volume. Cerebral arteries can be imaged clearly, which is advantageous in the diagnosis of vascular diseases such as cerebral aneurysms, arteriovenous malformations, and cerebrovascular occlusive disease. Before attacking a cerebrovascular lesion near or in the skull base, precise preoperative knowledge of anatomic relationships between the bony and neurovascular structures is critical for obtaining successful outcomes. The sensitivity of CTA for the detection of cerebral aneurysms ??5 mm in diameter may be higher than...
195.
Facial Nerve Neuroma: Surgical Concept and Functional Results - Minovi, Amir; Vosschulte, Regina; Hofmann, Erich; Draf, Wolfgang; Bockmühl, Ulrike
This study reviewed the management and outcomes of 11 facial nerve neuromas treated in our institution during the past two decades with particular emphasis on surgical concepts and functional outcomes. All patients underwent complete surgical resection of their tumor. Eight patients (73%) were followed on an outpatient basis. A retrospective chart review for pre- and postoperative clinical and radiological data was performed. All facial neuromas were multisegment tumors. All segments of the facial nerve were represented, but 54% involved the geniculate ganglion and 45% involved the labyrinthine or tympanic portions of the nerve, or both. Depending on the extent of...
196.
Nasal Solitary Fibrous Tumor Arising from the Anterior Cranial Fossa - Hicks, David L.; Moe, Kris S.
The solitary fibrous tumor (SFT) is a mesenchymal, spindle cell neoplasm that was originally found in pleural tissue. Recently, however, numerous extrapleural sites have been discovered, including the nasal cavity. We present the 15th case of a nasal SFT, and the first such tumor to arise from the cribriform plate and extend into the anterior cranial fossa. In addition to highlighting the aggressive nature of this tumor, we review its clinical features and the diagnostic difficulties posed by SFT.
197.
Combined Pre- and Retrosigmoid Approach for Petroclival Meningiomas with the Aid of a Rotatable Head Frame: Peri-Auricular Three-Quarter Twist-Rotation Approach: Technical Note - Fujitsu, Kazuhiko; Kitsuta, Yohichi; Takemoto, Yasunori; Matsunaga, Shigeo; Tateishi, Kensuke
We used the combined subtemporal presigmoid and suboccipital retrosigmoid multidirectional approach with the aid of a rotatable head frame (periauricular three-quarter twist-rotation approach) in 20 cases of petroclival meningiomas. Patients were placed in the lateral decubitus (park-bench) position. The head is twisted, rotated, and positioned 30 degrees face down in the Sugita rotatable head frame. By rotating this head frame, a 30- to 60-degree face-down position can be obtained when the suboccipital retrosigmoid route is used. Alternatively, the straight lateral or slightly brow-up position is obtained when the subtemporal presigmoid route is used. This twist-rotation approach provides multiple trajectories through...
198.
Closure of Dural Defects after Anterior Clinoid and Optic Canal Roof Removal: Technical Note - Pritz, Michael B.
A technique using vascularized pericranium to close dural defects after anterior clinoid and/or optic canal roof removal is described. This approach is simple, inexpensive, and uses autologous tissue. This method has provided satisfactory dural closure and has avoided cerebrospinal fluid leaks or extradural accumulation of cerebrospinal fluid.
181.
