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OBJECTIVE To analyze the influence of head positioning during preoperative image data acquisition on intraoperative accuracy of modern neuronavigation systems. MATERIAL AND METHODS All measurements were performed preoperatively before opening the head. In 24 patients, preoperative MR image data acquisition was performed twice on a 0.5 T scanner using a(More)
OBJECTIVES Advances in MR hardware performance and imaging techniques have enabled us to perform sub-second frame rate contrast enhanced MR angiographies as a clinical routine, resulting in subtraction angiographies with temporal resolutions similar to those obtained by conventional DSA. In this manuscript, we describe the technique of 2-D dynamic(More)
Vascular malformations of the spinal cord and its meninges are rare diseases which comprise true inborn cavernomas and arteriovenous malformations (AVM), including perimedullary fistulae, glomerular and juvenile AVMs, and presumably acquired dural arteriovenous fistulae. This article gives an overview of the imaging features on magnetic resonance imaging(More)
Diffusion-weighted magnetic resonance imaging (MRI) offers the possibility to study the course of the cerebral white matter tracts whereas functional MRI (fMRI) provides information about the specific functions of cortical areas. We evaluated the combination of fMRI and diffusion-weighted MRI to detect cortical visual areas with their corresponding visual(More)
Isolated posterior spinal artery aneurysms are rare vascular lesions. We describe the case of a 43-year-old man presenting with spinal subarachnoid hemorrhage after a minor trauma who was found to have a dissecting aneurysm of a posterior spinal artery originating from the right T4 level. Endovascular treatment was not contemplated because of the small size(More)
SUMMARY The pathogenesis of intracranial arterial aneurysms (AA) has been debated for many years and still remains unclear, although these entities might pose life-threatening risks to the patient and understanding the disease is of utmost importance for choosing treatment concepts. Apart from the "classical" berry-type aneurysm, there are different other(More)
Spontaneous aneurysmal subarachnoid haemorrhage (SAH) is a cause of stroke, which constitutes a severe trauma to the brain and may lead to serious long-term medical, psychosocial and endocrinological sequelae. Adrenocorticotrophic hormone deficiency, which is considered to occur in up to 20% of all survivors, is a possible consequence of bleeding. Moreover,(More)
Endovascular treatments of cerebral aneurysms with bare platinum coils have a higher rate of recurrence compared to surgical clipping. This may be related to failed vessel wall reconstruction since histological and scanning electron microscopy results following embolization failed to demonstrate neoendothelialization over the aneurysm neck. The present(More)
The results are presented for pterional orbital decompression in 12 patients with symptomatic traumatic retrobulbar hematoma after various traumatic mechanisms. Pre- and postoperative course, neuroradiological findings, additional brain or facial injuries as well as outcome of eye function are analyzed in detail. Mean time delay between trauma and(More)