Stefanie Hammersen

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OBJECT The use of dural grafts is frequently unavoidable when tension-free dural closure cannot be achieved following neurosurgical procedures or trauma. Biodegradable collagen matrices serve as a scaffold for the regrowth of natural tissue and require no suturing. The aim of this study was to investigate the efficacy and safety of dural repair with a(More)
The aim of image-guided neurosurgery is to accurately project computed tomography (CT) or magnetic resonance imaging (MRI) data into the operative field for defining anatomical landmarks, pathological structures and tumour margins. To achieve this end, different image-guided and computer-assisted, so-called “neuronavigation” systems have been developed in(More)
The authors report a case of neuronal ceroid lipofuscinosis (Kufs' disease) confirmed by stereotactically obtained brain biopsy findings and initially diagnosed as a butterfly glioma. The presenting symptoms in the 64-year-old patient were mental alterations with progressive dementia, followed by muscular atrophy and myoclonia with distal preponderance. The(More)
¶ Background. Surgical insertion of a ventriculoatrial shunt requires accurate placement of the atrial catheter in the right atrium in order to prevent postoperative complications. Fluoroscopy is the standard method for monitoring correct positioning of the catheter.  Methods. This paper reports a prospective study in 50 patients with the aim of comparing(More)
OBJECTIVE Navigation systems enable neurosurgeons to guide operations with imaging data. Sensor-based neuronavigation uses an electromagnetic field and sensors to measure the positions of the patient's brain anatomy and the surgical instruments. The aim of this investigation was to determine the accuracy level of sensor-based tracking in a large patient(More)
BACKGROUND Tracking of post-registration head motion is one of the major problems in frameless stereotaxy. Various attempts in detecting and compensating for this phenomenon rely on a fixed reference device rigidly attached to the patient's head. However, most of such reference tools are either based on an invasive fixation technique or have physical(More)
Bei Patienten mit Schädel-Hirn-Traumen tritt häufig die Frage auf, ob eine subjektiv empfundene Verhaltensauffälligkeit Krankheitswert hat und ggf. auf das erlittene Trauma zurückzuführen ist. Diese Frage lässt sich letztlich nur durch einen Kognitionspsychologen valide beantworten. Um ein einfaches und zuverlässiges Werkzeug für den Zweck der(More)
Das metastatisch bedingte akute spinale Kompressionssyndrom stellt eine onkologische Notfallsituation dar. Patienten mit einer entsprechenden Symptomatik (progrediente Rückenschmerzen, Myelonkompressionssyndrome) sollten umgehend in ein Zentrum eingewiesen werden, in dem sowohl eine umfassende Diagnostik als auch die entsprechenden Fachdisziplinen(More)
The most common cause of spontaneous subarachnoid bleeding (SAB) is a freshly ruptured cerebral aneurysm. The prognosis of an aneurysmal SAB essentially depends on the extent of the bleeding, the sequelae of subsequent vasospasms and the increase in intracranial pressure. Effective measures, such as increasing systemic blood pressure, can only be taken if(More)