Publications by authors named "Matthias Demetz"

Background: Socioeconomic factors influence survival in different cancer types. This study aimed to assess the impact of various socioeconomic factors, including education, marital status, lifestyle, and social network, on survival in patients with Isocitrate dehydrogenase (IDH) wildtype gliomas.

Methods: We conducted a retrospective analysis of 309 adult patients with de novo diagnosed IDH wildtype gliomas who underwent surgical treatment at our institution between 2014 and 2022.

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Integrating robotics in the operating room (OR) may revolutionize surgical practice by providing surgeons with enhanced precision, dexterity, and stability. Traditional operative microscopes often lead to significant musculoskeletal discomfort among surgeons due to prolonged, unergonomic postures. The advent of a robot-controlled exoscope (RS) offers a promising solution to these ergonomic challenges by enabling hands-free operation through head gestures.

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Importance: Variations in perioperative dexamethasone dosing are common in brain metastasis resection, but their impact on patient outcomes remains unclear.

Objective: To evaluate the association between perioperative dexamethasone dosing and patient outcomes, focusing on overall survival (OS) and progression-free survival (PFS).

Design, Setting, And Participants: This retrospective multicenter comparative effectiveness study used data collected from January 2010 to December 2023.

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Assessment of the potential impact of epilepsy as primary tumor manifestation on survival in elderly glioblastoma multiforme (GBM) patients. Two academic neurosurgical centers retrospectively analyzed all GBM patients aged 65 years and older with de-novo tumors, who underwent surgery between 2006 and 2021. Epidemiological, histopathological, imaging and survival data were obtained from patients' electronic charts, and screened for the presence of epilepsy preoperatively and during follow-up.

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Purpose: To assess whether the Modified 5 (mFI-5) and 11 (mFI-11) Factor Frailty Indices associate with postoperative mortality, complications, and functional benefit in supratentorial meningioma patients aged over 80 years.

Methods: Baseline characteristics were collected from eight centers. Based on the patients' preoperative status and comorbidities, frailty was assessed by the mFI-5 and mFI-11.

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Postoperative hemorrhage can severely affect the patients' neurological outcome after awake craniotomy. Higher postoperative blood pressure can increase the risk of postoperative hemorrhage. The aim of this study was to investigate the role of postoperative blood pressure and other common radiological and epidemiological features with the incidence of postoperative hemorrhage.

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Introduction: The age of patients requiring surgery for spinal metastasis, primarily those over 65, has risen due to improved cancer treatments. Surgical intervention targets acute neurological deficits and instability. Anticoagulants are increasingly used, especially in the elderly, but pose challenges in managing bleeding complications.

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Metastases are the most frequent intracranial malignant tumors in adults. While Karnofsky Performance Status (KPS) and Clinical Frailty Scale (CFS) are known to have significant impact on overall survival (OS), temporal muscle thickness (TMT) has been postulated to be a promising new parameter to estimate prognosis. Patients who received a resection of one to three brain metastases in our institution were included.

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This study aims to evaluate the clinical outcome of stereotactic radiosurgery as the sole treatment for brain metastases and to assess prognostic factors influencing survival. A total of 108 consecutive patients with 213 metastases were retrospectively analyzed. Treatment was determined with close-meshed MRI follow-up.

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The conventional microscope has the disadvantage of a potentially unergonomic posture for the surgeon, which can affect performance. Monitor-based exoscopes could provide a more ergonomic posture, as already shown in pre-clinical studies. The aim of this study was to test the usability and comfort of a novel head-mounted display (HMD)-based exoscope on spinal surgical approaches in a simulated OR setting.

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Background And Objectives: Demographic changes will lead to an increase in old patients, a population with significant risk of postoperative morbidity and mortality, requiring neurosurgery for meningiomas. This multicenter study aims to report neurofunctional status after resection of patients with supratentorial meningioma aged 80 years or older, to identify factors associated with outcome, and to validate a previously proposed decision support tool.

Methods: Neurofunctional status was assessed by the Karnofsky Performance Scale (KPS).

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Article Synopsis
  • Radiation necrosis (RN) is a potential late complication from stereotactic radiosurgery (SRS), and this study aimed to examine how tumor location affects the risk of developing RN, particularly for skull base (SB) versus non-skull base tumors.
  • The study analyzed data from 205 patients treated for benign tumors between 2004 and 2020, finding that 76.6% of tumors were located at the skull base and determining that 15.6% of patients developed RN after treatment, with SB tumors showing a significantly lower risk.
  • Results indicate that while the risk of RN for SB tumors is low, higher radiation doses do increase the likelihood of developing RN, suggesting the continued importance of SRS for
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Purpose: Data on differences in overall survival and molecular characteristics between incidental (iLGG) and symptomatic lower grade Glioma (sLGG) are limited. The aim of this study was to investigate differences between patients with iLGG and sLGG.

Methods: All adult patients with a histologically proven diffuse (WHO°II) or anaplastic (WHO°III) glioma who underwent their first surgery at the authors' institution between 2010 and 2019 were retrospectively included.

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Distant intercellular communication in gliomas is based on the expansion of tumor microtubuli, where actin forms cytoskeleton and GAP-43 mediates the axonal conus growth. We aimed to investigate the impact of GAP-43 and actin expression on overall survival (OS) as well as crucial prognostic factors. FFPE tissue of adult patients with diffuse and anaplastic gliomas, who underwent first surgery in our center between 2010 and 2019, were selected.

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Background: Advanced intercellular communication is a known oncogenic factor. In the central nervous system, Connexin-43 (Cx43) forms this junctional networking. Moreover, it correlates with the proliferation rate, and thus behavior, of gliomas.

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Purpose: To assess the impact of individual surgeon experience on overall survival (OS), extent of resection (EOR) and surgery-related morbidity in elderly patients with glioblastoma (GBM), we performed a retrospective case-by-case analysis.

Methods: GBM patients aged ≥ 65 years who underwent tumor resection at two academic centers were analyzed. The experience of each neurosurgeon was quantified in three ways: (1) total number of previously performed glioma surgeries (lifetime experience); (2) number of surgeries performed in the previous five years (medium-term experience) and (3) in the last two years (short-term experience).

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Radiation necrosis represents a potentially devastating complication after radiation therapy in brain tumors. The establishment of the diagnosis and especially the differentiation from progression and pseudoprogression with its therapeutic implications requires interdisciplinary consent and monitoring. Herein, we want to provide an overview of the diagnostic modalities, therapeutic possibilities and an outlook on future developments to tackle this challenging topic.

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Article Synopsis
  • The study investigates the impact of using sodium fluorescein during brain metastasis surgeries to improve tumor resection outcomes and reduce residual tumor volume.
  • Postoperative results showed that patients undergoing fluorescence-guided surgery had significantly lower residual tumor volumes and a decreased risk of local recurrence compared to those who did not use fluorescein.
  • Overall survival was not affected by the use of fluorescein, but postoperative radiotherapy did lead to longer survival rates.
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Introduction: Conventional microscopes have certain limitations in terms of posture and ergonomics. Monitor-based exoscopes could solve this problem and thereby lead to less work-related sick leave for surgeons.

Research Question: The aim of this study was to assess the ergonomics, usability, and neurosurgeon's comfort of a novel three-dimensional head-mounted display-based exoscope in a standardized setting.

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Introduction: Tumor-treating fields (TTFs) are a specific local oncological treatment modality in glioblastoma multiforme WHO° IV (GBM). Their mechanism of action is based on the effect of electrical fields interfering with the mitotic activity of malignant cells. Prospective studies have demonstrated efficacy, but TTF benefits are still controversially discussed.

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Purpose: The Clinical Frailty Scale (CFS) evaluates patients' level of frailty on a scale from 1 to 9 and is commonly used in geriatric medicine, intensive care and orthopedics. The aim of our study was to reveal whether the CFS allows a reliable prediction of overall survival (OS) in patients after surgical treatment of brain metastases (BM) compared to the Karnofsky Performance Score (KPS).

Methods: Patients operated for BM were included.

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Purpose: We evaluated differentiations in gadolinium contrast enhancement (CE) between low-grade WHO °II and high-grade WHO °III gliomas in conventional MRI, which have been repeatedly questioned.

Methods: Ninety-nine patients, who underwent first resection of WHO°II and °III gliomas, were retrospectively retrieved from a prospective database. The quantitative metric volume of Gd-CE in T1-weighted pre-operative MRI was measured using volumetric segmentation.

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Purpose: single-staged stereotactic radiosurgery (SRS) is an established part of the multimodal treatment in neuro-oncology. Radiation necrosis after high-dose irradiation is a known complication, but there is a lack of evidence about the risk factors. The aim of this study was to evaluate possible risk factors for radiation necrosis in patients undergoing radiosurgery.

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With the rising life expectancy and availability of neuroimaging, increased number of older patients will present with diffuse and anaplastic gliomas. The aim of our study was therefore to investigate age-related prognostic clinical, neuropathological and radiological features of lower-grade gliomas. All consecutive patients with diffuse or anaplastic glioma WHO grade 2 and 3 who underwent first tumor resection between 2010 and 2018, were selected from the institutional neuro-oncological database and evaluated.

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