Search Results (249)

Objective: Deep Brain Stimulation (DBS) has been consolidated as a valid therapeutic option for advanced Parkinson’s disease (PD). The identification of specific targets can be achieved through different methods, including conventional direct and indirect methods. The aim of our multicentric study is to provide a comparison between these traditional methods and artificial intelligence (AI) in the ascertainment of the ideal targets. Materials and Methods: A total of eight patients, who received bilateral STN (subthalamic nucleus) DBS implantation between 2022 and 2023 were analyzed. Target coordinates were calculated based on the Schaltenbrand and Wahren atlases and the AI using the RebrAIn system during the planning phase; intraoperatively, the targets were either confirmed or adjusted according to microelectrode recordings (MERs). The differences in the three Cartesian axes of stereotactic coordinates (X, Y, and Z) according to these methods were evaluated and compared through non-parametric ANOVA Friedman test. Results: The results revealed significant agreement in the lateral–lateral coordinates (X, X′, X″), indicating stability in target determination along this axis across the methods. However, more substantial discrepancies were observed in the antero-posterior and cranio-caudal coordinates, suggesting lower consistency between the examined methodologies. Conclusions: Our preliminary study results suggest that, despite the challenges posed by interindividual anatomical variability and the limitations of imaging techniques, artificial intelligence has shown comparable values on the lateral–lateral X coordinates. The accuracy of predictive targeting using machine learning models needs to be validated by further studies, but the preliminary results appear to indicate a potential promising role for artificial intelligence in integrating the preoperative workflow. Full article

Background and Objectives: Functional neurosurgery encompasses surgical interventions aimed at modulating the function of the central and peripheral nervous systems. Spinal cord stimulation (SCS), as a form of neuromodulation, is an established treatment for chronic pain and is increasingly utilized by both anesthesiologists and neurosurgeons. The aim of this study was to evaluate the effectiveness of SCS in patients with chronic neuropathic spinal pain. Materials and Methods: This prospective study included 42 patients who demonstrated a positive response to trial stimulation. Only patients achieving a clinically meaningful response (≥50% pain reduction) during the trial phase were included in the final analysis. Pain intensity and functional disability were assessed using the Visual Analog Scale (VAS) and the Oswestry Disability Index (ODI). All patients underwent a two-stage percutaneous implantation procedure using burst stimulation. A follow-up assessment was performed 3–6 months after implantation. Results: A statistically significant reduction in pain intensity was observed (p < 0.0001), with median VAS scores decreasing from 8 to 3, corresponding to a 62.5% reduction in pain intensity and exceeding the minimal clinically important difference (MCID) for VAS. Functional status improved significantly, with ODI scores decreasing from 74% to 38%, markedly surpassing the established MCID threshold. A clinically meaningful reduction in pain (≥50%) was achieved in the majority of patients. All patients requiring opioid analgesics at baseline discontinued their use following SCS implantation, and a reduction in overall analgesic consumption was observed across the cohort. Conclusions: These findings suggest that burst SCS may be an effective treatment option for carefully selected patients with chronic neuropathic spinal pain who are not candidates for conventional spine surgery. However, the results should be interpreted with caution due to the enriched study design and limited follow-up period. Full article

Over the past decades, neurosurgery has undergone a profound transformation driven by technological innovation and a paradigm shift toward patient-centered outcomes. Historically evaluated through mortality rates and extent of resection, modern neurosurgery increasingly prioritizes preservation of neurological function, cognitive integrity, and quality of life. Innovations such as intraoperative mapping, multimodal neuromonitoring, image-guided surgery, minimally invasive techniques, and enhanced recovery protocols have reshaped surgical decision-making. However, the true value of these advancements lies in their measurable impact on clinically meaningful outcomes. This narrative review examines how technical progress translates into functional, cognitive, and quality-of-life benefits, while critically discussing current limitations of evidence and future directions toward personalized, outcome-driven neurosurgery. Full article

Tethered cord syndrome (TCS) is a disease caused by pathological fixation of the spinal cord, most commonly due to a thickened filum terminale, postoperative adhesions, or congenital dysraphism. Progressive neurological, urological, and orthopedic manifestations result from chronic cord traction and impaired vascular supply. Surgical detethering remains the standard treatment, with the classic intradural sectioning of the filum terminale being the most widely used technique. Recent developments, however, include minimally invasive tubular and endoscopic approaches, spinal column shortening procedures for recurrent or complex cases, and extradural detethering strategies. Each technique aims to reduce cord tension while minimizing postoperative complications, particularly cerebrospinal fluid leakage and retethering. This review summarizes the anatomical background, pathophysiology, and operative strategies for TCS, highlighting current evidence, technical nuances, and limitations of emerging minimally invasive and alternative approaches. Full article

Craniopharyngioma (CP) is a rare benign tumor of the sellar and suprasellar region that often compresses the optic pathways, causing significant visual impairment in both children and adults. The early detection and monitoring of optic nerve involvement are essential for preserving visual function. Optical coherence tomography (OCT) and OCT angiography (OCTA) are noninvasive, high-resolution imaging modalities that provide quantitative assessment of retinal nerve fiber layer (RNFL) thickness, ganglion cell complex (GCC), and retinal microvasculature. Thinning of the RNFL and GCC correlates with visual field defects and reduced visual acuity and may also serve as a predictor of postoperative visual recovery. OCTA reveals microvascular alterations that may precede structural damage and, together with other imaging parameters, can be used to estimate the likelihood of visual improvement after neurosurgery. This review summarizes current evidence on the use of OCT and OCTA in CP, highlighting their applications in assessment of optic pathway involvement, preoperative evaluation, postoperative monitoring, and risk stratification. Based on our clinical experience, we propose a table with recommended OCT parameters and follow-up intervals. Importantly, OCT should be interpreted alongside the visual acuity, visual field testing, and fundus examination for comprehensive assessment. Future directions include the standardization of imaging protocols and prospective multicenter studies, and integration of OCTA metrics into predictive models of visual outcomes. OCT and OCTA provide objective, reproducible biomarkers that support individualized patient care and may improve visual prognosis in CP. Full article

Background/Objectives: Anesthesia for intracranial neurosurgery presents unique challenges because of the sensitivity of the brain to perioperative physiological disturbances, yet neuroanesthetic practice remains highly variable and supported by a limited high-level evidence base. We conducted a scoping review to map and characterize multicenter randomized controlled trials (RCTs) evaluating perioperative management strategies in adults undergoing intracranial neurosurgery. Methods: This scoping review was reported in accordance with the PRISMA extension for Scoping Reviews. MEDLINE, PubMed, EMBASE, Cochrane Central, and Web of Science were searched from inception to 25 June 2025. Multicenter RCTs enrolling adults undergoing intracranial neurosurgery and evaluating anesthetic, hemodynamic, ventilatory, or perioperative interventions were included. We prioritized mapping multicenter designs for their greater external validity and implementation potential. Data were extracted in duplicate and summarized descriptively. Results: Of 417 records identified, 13 multicenter trials (≥2 recruiting sites) involving 2765 participants across nine countries from 1997–2025 were included. Most trials evaluated anesthetic maintenance or opioid regimens (7/13), followed by post-craniotomy pain control (3/13), ventilation/brain relaxation strategies (1/13), antiemetic prophylaxis (1/13), and temperature management (1/13). Outcomes were predominantly short-term and process-based (hemodynamics 7/13, opioid use 7/13, emergence metrics 5/13). Patient-centered outcomes were rarely measured (mortality 1/13, functional neurological outcome 1/13, cognitive outcome 1/13; quality of life 0/13). Only one trial assessed outcomes at ≥72 h postoperatively. Over half of the included trials were judged at high risk of bias. Conclusions: Multicenter RCT activity in neuroanesthesia remains sparse and narrowly focused, highlighting the need for larger, methodologically robust trials targeting patient-centered and long-term outcomes. Full article

Background/Objectives: Pediatric neurosurgical procedures often involve significant blood loss and rapid hemodynamic shifts, necessitating accurate hemoglobin (Hb) monitoring. While continuous non-invasive Hb (SpHb) monitoring offers real-time trending, its accuracy in high-risk pediatric populations remains debated. We aimed to evaluate the diagnostic accuracy and clinical utility of SpHb compared to invasive arterial blood gas (ABG) analysis in pediatric patients undergoing cranial and spinal surgeries. Methods: This prospective, observational study enrolled 60 pediatric patients (aged 0–16 years) scheduled for high-risk neurosurgery. SpHb was measured continuously and compared with intermittent ABG-Hb values. Statistical analysis included Bland–Altman agreement, Pearson’s correlation, and Error Grid Analysis. Subgroup analyses assessed the impact of the Perfusion Index (PI), hypotension, and metabolic acidosis on device performance. Results: Data from 57 patients (median age: 12 months, interquartile range: 6–42 months; 70.2% aged <24 months) were analyzed. SpHb demonstrated a moderate correlation with ABG-Hb (r = 0.567, p < 0.001) but exhibited systematic overestimation with a mean bias of +1.60 ± 1.54 g/dL. Crucially, SpHb showed 0% sensitivity for detecting critical anemia (Hb < 8.0 g/dL). Device performance was significantly compromised by physiological extremes: severe metabolic acidosis significantly increased bias to +2.27 g/dL (p = 0.038), and intraoperative hypotension significantly widened the limits of agreement (SD of bias: 1.79 g/dL vs. 1.45 g/dL in normotension). Furthermore, hemodynamic analysis revealed a loss of autoregulation during hypotension, where the pressure-perfusion coupling strengthened (r = 0.44) compared to the normotensive state (r = 0.15). Conclusions: SpHb monitoring provides fair Hb trending but is limited by systematic overestimation and poor sensitivity for critical anemia. Accuracy worsens during severe acidosis and hemodynamic instability. Therefore, SpHb should function as a complementary “early warning” trend monitor rather than a sole transfusion trigger, with invasive validation remaining essential for intraoperative decision-making. Full article

Introduction: Significant studies have substantiated the evidence for complete resection of intrinsic brain tumours in recent years. However, achieving this through a single surgery is not always possible due to tumour localisation in eloquent areas. Therefore, the present analysis aimed to evaluate surgical outcomes in a cohort of patients undergoing planned two-stage glioma surgery. Methods: Patients who underwent surgery for diffusely infiltrating brain tumours between 2013 and 2023 at the Department of Neurosurgery at Düsseldorf University Hospital were screened for undergoing two-stage surgery, defined by a priori-considered surgical re-intervention up to 6 weeks after the initial surgery. Results: Of 1558 patients with glioma, 447 underwent multiple surgeries, of whom 36 underwent planned two-stage surgery during the course of their disease. Two-stage surgery was performed mostly as glioma surgery at first diagnosis (75%). The mean time between the first and second surgery was 11.67 days (±7.59). Two-stage surgery was performed due to various reasons, mostly in localisations that required multifocal approaches (47.2%), due to non-compliance during initial awake surgery (30.6%), or cases with primary debulking for subsequent awake-surgery approaches (22.2%). Tumours were mainly located in the left hemisphere (50%) (right hemisphere 25%, or bilateral 25%) and motor- or speech-eloquent in 61.11%. Tumours were 72.2% IDH-wildtype. An intended complete resection result was achieved in 58.88% after the second surgery, changing from 93.94% submaximal resection to 58.88% supramaximal and maximal resection after the second surgery. Second surgery significantly reduced residual tumour volume of both T1-CE (Wilcoxon signed-rank test, Z = −4.62, p < 0.001) and T2-nCE (Z = −4.62, p < 0.001). In contrast, functional (KPS: Z = −0.93, p = 0.350) and neurological status (NIHSS: Z = −0.89, p = 0.372) did not significantly change. Perioperative complications of the second surgery occurred in nine (25%) cases, requiring surgical intervention under general anaesthesia or ICU treatment (Clavien–Dindo grade IIIb/IV) in six (16.67%) cases. Conclusion: Planned two-stage surgery was mostly performed as a surgical strategy in eloquent locations to achieve supramaximal or maximal resection. A two-staged surgery significantly extended resection results without neurological and functional deterioration. Despite relevant complication rates, primary debulking followed by staged resection as well as two-staged multifocal approaches may yield a favourable risk–benefit profile. Full article

Photobiomodulation (PBM) has emerged as a noninvasive therapeutic tool with promising clinical applications in veterinary clinical surgery. Its mechanism of action is based on the stimulation of cellular processes through low-intensity light, promoting adenosine triphosphate production, inflammatory modulation, and tissue regeneration. This narrative review examines the current state of knowledge on the use of PBM in veterinary surgical contexts, with an emphasis on its clinical application in wound healing, postoperative pain control, and functional recovery. The physiological foundations of the technique, the main technical parameters that determine its effectiveness (wavelength, dose, frequency, and mode of application), and the available clinical evidence from different specialties such as soft tissue surgery, orthopedics, dentistry, and neurosurgery are analyzed. Current limitations, such as the lack of standardized protocols and their limited inclusion in clinical guidelines, are also addressed, as are future opportunities related to treatment personalization, the development of specific veterinary devices, and integration with emerging technologies. PBM represents a safe and effective adjuvant therapeutic strategy with the potential to become an integral part of veterinary postoperative management. Full article

Cervical spinal cord injury causes severe functional impairment with limited spontaneous recovery, and while spinal cord stimulation has emerged as a promising neuromodulatory strategy, evidence for cervical applications remains fragmented. To address this gap, we conducted a systematic review synthesizing preclinical and clinical evidence on cervical spinal cord stimulation for functional rehabilitation following spinal cord injury. The review was registered on PROSPERO (CRD420251088804) and conducted in accordance with PRISMA guidelines, with PubMed, Embase, IEEE Xplore, and Web of Science searched from inception to July 2025 for animal and human studies of cervical spinal cord stimulation, including epidural, intraspinal, and transcutaneous approaches, reporting functional neurological outcomes. Risk of bias was assessed using the Cochrane RoB 2 and ROBINS-I tools, and due to substantial heterogeneity, results were synthesized narratively. Thirty-one studies comprising 119 animals and 156 human participants, met inclusion criteria. Across studies, outcome measures such as GRASSP, ISNCSCI, and dynamometry consistently demonstrated improvements in hand strength, dexterity, and voluntary motor activation. Several studies also reported gains in sensory and autonomic function, whereas respiratory outcomes were infrequently assessed. Adjunctive interventions, including cortical stimulation, brain–computer interface priming, and task-specific training frequently augmented recovery. Adverse events were generally mild, although overall risk of bias was predominantly serious. Overall, cervical spinal cord stimulation demonstrates preliminary assistive and therapeutic effects on motor recovery, with additional sensory, autonomic, and potential respiratory benefits. Full article

Background: IDH1-mutant oligodendroglioma and astrocytoma differ not only in growth rate but also in growth pattern. Oligodendrogliomas tend to infiltrate white matter tracts, whereas astrocytomas more often displace them. Such difference could lead to different cognitive outcomes. This study examined differences in executive functioning before and up to one year after surgery between patients with IDH1-mutant astrocytoma and oligodendroglioma. Methods: Patients with WHO grade 2–3 IDH1-mutant oligodendroglioma (1p19q-codeleted) or astrocytoma were included. Cognition was assessed preoperatively, and at 3 and 12 months postoperatively using standardized computerized and paper-and-pencil tests. Groups were compared on demographics, tumor characteristics, surgical modality, extent of resection, adjuvant treatment, and baseline cognition. Longitudinal mixed models were performed to investigate differences in performances over time for the total sample and stratified by surgical approach (awake vs. asleep). Results: 162 patients (67 oligodendroglioma, 95 astrocytoma) were included. Oligodendroglioma patients were older, with more frontal and fewer temporal tumors. Oligodendroglioma patients showed a greater impairment prevalence on a measure of inhibition before surgery. In the awake surgery group, no longitudinal differences were found between diagnoses. In the asleep surgery group, astrocytoma patients remained stable while oligodendroglioma patients declined on a measure of cognitive flexibility, with performance at 3 and 12 months significantly lower than at baseline. Conclusions: Specific aspects of executive functioning in IDH1-mutant gliomas may differ by subtype. Oligodendroglioma patients showed postoperative decline in cognitive flexibility that did not recover to baseline level, particularly in case of surgery under general anesthesia. These results highlight the potential relevance of tumor subtype and surgical approach in limiting cognitive risks after glioma surgery. Full article

Background/Objectives: Managing large midline olfactory groove meningiomas is especially difficult in elderly patients who have limited physiological reserves. Here we describe a unique and dangerous geriatric case where we used new quantifiable anatomical measurements and developed a structured multidisciplinary preoperative and postoperative protocol to assist in all aspects of surgery. Case Presentation: A 68-year-old male with fronto-lobe syndrome and disability (astasia-abasia; Tinetti Balance Score of 4/16 and Gait Score of 0/12) as well as cognitive dysfunction (MoCA score of 12/30) and blindness bilaterally. Imaging prior to surgery demonstrated a very large olfactory groove meningioma which severely compressed both optic pathways at the level of the optic canals (up to 71% reduction in cross-sectional area of the optic nerves) and had complex vascular relationships with the anterior cerebral artery complex (210° contact surface). Due to significant cardiovascular disease and liver disease, his care followed a coordinated optimization protocol for the perioperative period. He underwent bifrontal craniotomy, initial early devascularization and then staged ultrasonic internal decompression (approximately 70% reduction in tumor volume) and finally microsurgical dissection of the tumor under multi-modal monitoring of neurophysiology. Discussion: We analyzed his imaging data prior to surgery using a standardized measurement protocol to provide quantitative measures of the degree of compression of the optic pathways (traction-stretch index = 1.93; optic angulation = 47.3°). These quantitative measures allowed us to make a risk-based evaluation of the anatomy and to guide our choices of corridors through which to dissect and remove the tumor. Following surgery, imaging studies demonstrated complete removal of the tumor with significant relief of the frontal lobe and optic apparatus from compression. His pathology showed that he had a WHO Grade I meningioma with an AKT1(E17K) mutation identified on molecular profiling. Conclusions: This case is intended to demonstrate the feasibility of integrating quantitative anatomical measurements into a multidisciplinary, protocol-based perioperative pathway to maximize the safety and effectiveness of the surgical removal of a complex and high-risk skull-base tumor. While the proposed quantitative indices are experimental and require additional validation, the use of a systematic approach such as this may serve as a useful paradigm for other complex skull-base cases. Full article

Background and Objectives: The usefulness of extracorporeal membrane oxygenation (ECMO) therapy for acute respiratory distress syndrome (ARDS) in patients with traumatic brain injury (TBI), spontaneous intracerebral hemorrhage (ICH), or subarachnoid hemorrhage (SAH) is limited. This study aimed to investigate the survival benefit of ECMO in ARDS that developed during hospitalization in high-risk neurological patients. Materials and Methods: This retrospective study evaluated patients with TBI or spontaneous ICH and SAH admitted to our hospital’s neurosurgery intensive care unit and who received ECMO therapy for ARDS between March 2017 and March 2024. Clinicodemographic characteristics, indications for and methods of ECMO application, occurrence of comorbidities, hospital survival rates, and ECMO weaning success rates were compared between survivors and non-survivors. Results: Among the 16 patients evaluated, seven (43.8%) were successfully discharged. The mean ages of the survivor and non-survivor groups were 52.1 and 58.6 years, respectively. The PaO₂/FiO₂ ratio pre-ECMO was similar in both groups (66.6 vs. 69.2); however, it improved significantly post-ECMO in the survivor group (264.1 vs. 209.4). The ECMO success rate was 100% in the survivor group and only 33.3% in the non-survivor group. The intensive care unit and hospital lengths of stay were longer in the survivor group. Most patients received veno-venous ECMO, and hemorrhagic complications were rare. Conclusions: ECMO for ARDS in patients with severe TBI or spontaneous ICH and SAH positively impacts survival and functional recovery and may be a beneficial treatment modality. Full article

Postoperative hemorrhage (POH) is a rare but serious complication of cranial neurosurgery, often resulting in neurological deterioration and necessitating urgent surgical intervention. Despite its clinical relevance, POH remains underreported and insufficiently understood. This study aimed to identify potential risk factors including perioperative variables and tumor-related characteristics associated with POH requiring surgical evacuation. A total of 1862 cranial tumor procedures were performed in our department over a 10-year period. Data on perioperative parameters and tumor characteristics were retrospectively collected and analyzed. Statistical analyses were conducted to assess associations of them to POH. Statistical analysis revealed several peri- and postoperative variables significantly associated with POH in univariate analyses. These included intraoperative blood loss (p = 0.012) and length of postoperative hospital stay (p = 0.016). Furthermore, the outcomes measured using the Glasgow Outcome Scale (p < 0.001) and the Karnofsky Performance Scale (p < 0.001) showed also statistical relevance as a result of postoperative bleeding in these patients. The findings suggest that specific perioperative factors particularly intraoperative blood loss are associated with an increased risk of POH after intracranial tumor surgery. Additionally, prolonged hospitalization and worsened functional outcomes were linked to the occurrence of postoperative hemorrhage. In contrast, tumor-specific characteristics and routine laboratory values showed no significant association with hemorrhagic complications in this cohort. Full article

Oxidative stress (OS) reflects a pathologic imbalance between excessive production of reactive oxygen species (ROS) and insufficient antioxidant defenses. Growing evidence indicates that a healthy gut microbiota (GM) is essential for regulating redox homeostasis, whereas gut dysbiosis contributes to elevated ROS levels and oxidative damage in DNA, lipids, and proteins. This redox disequilibrium initiates a cascade of cellular disturbances—including synaptic dysfunction, altered receptor activity, excitotoxicity, mitochondrial disruption, and chronic neuroinflammation—that can, in turn, impair cognitive and social functioning in metabolic and neuropsychiatric disorders via epigenetic mechanisms. In this review, we synthesize current knowledge on (1) how OS contributes to cognitive and social deficits through epigenetic dysregulation; (2) the role of disrupted one-carbon metabolism in epigenetically mediated neurological dysfunction; and (3) mechanistic links between leaky gut, OS, altered GM composition, and GM-derived epigenetic metabolites. We also highlight emerging microbiota-based therapeutic strategies capable of mitigating epigenetic abnormalities and improving cognitive and social outcomes. Understanding the OS–microbiota–epigenetic interplay may uncover new targetable pathways for therapies aimed at restoring brain and behavioral health. Full article