M Bettag

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OBJECTIVE The aim of this study was to analyse the value of intraoperative micro-Doppler in stereotactic brain biopsy (SBB). So far, only a few studies have reported about the usefulness of micro-Doppler in stereotactic brain biopsy. METHODS Between 1998 and 2003, 155 SBBs were performed in 153 patients with micro-Doppler (81 males, 72 females, mean age:(More)
The 1.06 micron Nd:YAG laser and a new fiberoptic delivery system, the Interstitial Thermo-Therapy (ITT) laser fibre, allows stereotactic interstitial irradiation of cerebral tumours. In experimental rat brain studies we found typical laser-tissue effects with a central necrosis and a sharply demarcated oedema towards the normal brain. The size of the(More)
BACKGROUND The natural history of brain stem cavernous malformations is unfavorable because of their high hemorrhage rate and resulting neurological deterioration among patients. However, direct surgery of intrinsic and anteriorly situated cavernomas is hazardous and leads to a bad postoperative outcome because of trauma to lateral and dorsally situated(More)
Tumors of the oculomotor nerve are rare and most instances reported have been schwannomas. The authors present clinical, neuroradiological, and neuropathological findings in a 70-year-old woman with a glioblastoma multiforme (GBM) growing primarily in the proximal part of the left oculomotor nerve. The patient presented with a 1-month history of transient(More)
OBJECTIVE The aim of this study was to evaluate the combination of spinal tap test (STT) with cerebral perfusion measurement assessed either by Tc-bicisate-SPECT (Tc-SPECT) or perfusion weighted MRI (pwMRI), or both, for a better preoperative selection of promising candidates for shunt operations in suspected idiopathic normal pressure hydrocephalus. (More)
OBJECTIVE We retrospectively analyzed the indications, surgical techniques, and applicability of frameless neuronavigation to endoscopic procedures in a heterogeneous group of 15 patients. MATERIAL AND METHODS In 8 patients indications for surgery were cystic lesions, in 3 patients intraventricular tumors, and in 4 patients occlusive hydrocephalus. The(More)
Monostotic manifestation of fibrous dysplasia in the spine is exceedingly rare. We report the case of a 30 year-old woman suffering from slowly increasing low back pain. Radiologically a polycyclic, slightly gadolinium-enhancing, solitary lesion within the first lumbar vertebral body was detected. The lesion was removed and stabilized with bone marrow(More)
AIM Aim of this report was to present recently collected data on neurosurgical workforce in the countries of the EU and associated states. METHODS Data were obtained from 27 countries by means of a questionnaire developed by members of a working group of the UEMS Section of Neurosurgery (UEMS = Union Europénne des Médecins Spécialistes; European Union of(More)
OBJECT In spite of the development of approximately 200 different shunt systems within the last 50 years, overdrainage and valve obstructions are still major problems in the current treatment of hydrocephalus. In 1994, a new gravitational valve with different opening pressures (depending upon the patient's posture) and a big contact area to CSF was(More)
Parasellar paragangliomas are rare tumors. As far as we know, only ten cases are described in the literature. Their clinical, pathological, and radiological features and possible origin are discussed in this article and a review of the literature is given. Additionally, we report a new case of a 51-year-old woman with paraganglioma growing in the anterior,(More)