This Week in Neurosurgery — Jun 23, 2026

Welcome to This Week in Neurosurgery. This week we're covering 10 notable papers spanning pediatric cerebrospinal fluid management, advanced techniques in functional and spinal neurosurgery, and critical decision-making in geriatric trauma and neuro-oncology. Let's dive in.

We begin in the field of pediatric neurosurgery, where three new publications address critical aspects of oncology, shunt infection, and hydrocephalus management. Writing in the Journal of Neurosurgery: Pediatrics, Krajewski and colleagues analyzed data from the prospective, multicenter E-HIT2000 trial, evaluating two hundred ninety-one pediatric patients with nonmetastatic intracranial ependymoma across seventy-one centers [7]. Central neuroradiological review was performed on postoperative imaging for two hundred six patients, revealing a gross-total resection rate of sixty-seven percent, while thirty-three percent had residual disease. Crucially, surgeons erroneously reported achieving a gross-total resection in eleven out of forty cases where residual disease was actually present on central review, with adhesions to the brainstem being the most common reason for leaving intentional residual tumor. When patients with residual disease underwent a second surgery as part of their primary treatment, gross-total resection was achieved in nearly half of them after up to three procedures. Importantly, this second surgery did not increase the frequency of postoperative neurological deficits compared to those who had a gross-total resection initially. The clinical payoff was substantial: a second surgery significantly improved ten-year progression-free survival to over forty-two percent, compared to just twenty-two percent for those who did not undergo a repeat operation, while overall survival at ten years was nearly seventy percent with gross-total resection versus fifty-one percent with residual disease. Moving from pediatric oncology to cerebrospinal fluid management, a multicenter study from the Hydrocephalus Clinical Research Network, published in the Journal of Neurosurgery: Pediatrics, provides much-needed clarity on the epidemiology of late cerebrospinal fluid shunt infections, defined as those occurring more than six months after surgery [8]. Analyzing over sixty-six hundred shunt procedures in patients under eighteen years old, the investigators identified early infections in four point three percent of cases and late infections in zero point nine percent, meaning late infections accounted for nearly seventeen percent of all shunt infections. The authors found that late infections are clinically distinct from early ones; they are significantly more likely to present with abdominal pseudocysts—occurring in twenty-four percent of late infections compared to less than four percent of early infections—and they are far less likely to be diagnosed via positive cerebrospinal fluid cultures. Furthermore, late infections were frequently preceded by secondary clinical events, such as abdominal surgeries in twenty-one percent of cases, shunt taps in twenty-three percent, and bacteremia in nine percent. Clinicians treated late infections differently, using vancomycin less frequently and opting for complete shunt removal in sixty-five percent of cases compared to eighty-eight percent for early infections. Despite these treatment differences, long-term shunt survival did not differ significantly between the early and late infection groups, highlighting the need for vigilant, long-term surveillance and tailored diagnostic strategies. In the same journal, Lai and colleagues address a long-standing debate in neonatal neurosurgery: the timing of intervention for progressive posthemorrhagic ventricular dilatation in preterm infants [9]. This international, multicenter study of one hundred seventy preterm infants compared outcomes between early intervention centers—which intervened at lower ventricular indices—and late intervention centers. Infants managed at late intervention centers were more premature and had lower birth weights, with initial neurosurgical intervention occurring at a median of thirty-one point five days of life, compared to just eighteen days in the early intervention group. While early intervention centers utilized lumbar punctures more frequently and had a lower overall rate of ventriculoperitoneal shunt insertion—thirty percent compared to sixty-two percent in late intervention centers—there was no statistically significant difference in postoperative surgical complication rates between the two strategies, which stood at eleven percent for early and twenty-four percent for late intervention. On multivariable analysis, the risk of surgical complications was driven entirely by lower gestational age and lower birth weight rather than the timing of the intervention itself, supporting cautious early cerebrospinal fluid diversion in these fragile, low-birth-weight infants.

Next, we turn to functional neurosurgery and minimally invasive spine, where several new papers offer practical guidance for patient selection, procedural optimization, and recovery tracking. In the first study, Khalid and colleagues present a twenty-four-year single-center experience with vagus nerve stimulation for refractory epilepsy in three hundred fifty-six patients, published in the Journal of Neurosurgery [4]. While vagus nerve stimulation is a well-established therapy, this study sought to identify which patient-specific factors predict a favorable response, defined as a fifty percent or greater reduction in seizure frequency. Surprisingly, patient age at implantation, sex, seizure etiology, and magnetic resonance imaging findings had no significant impact on efficacy. Instead, baseline seizure frequency was the primary predictor of success. Patients with a low baseline seizure frequency of only one to two seizures per year, or one to two per month, experienced the greatest benefit, showing significantly better outcomes and, in the case of the annual seizure group, a significant reduction in their antiseizure medication burden. Meanwhile, Du and colleagues focused on optimizing percutaneous balloon compression for trigeminal neuralgia in another Journal of Neurosurgery paper [5]. Utilizing a propensity score-matched analysis of two hundred thirty patients, the authors compared effective and ineffective treatments to build a highly discriminative predictive model. They found that patient demographics did not influence outcomes; instead, intraoperative physical parameters were the sole determinants of success. Specifically, the volume of the balloon, the duration of compression, the intraoperative balloon pressure, and the final shape of the inflated balloon were all independent predictors of treatment efficacy. The resulting multivariate model achieved an outstanding area under the curve of zero point eight nine, offering a potential framework for real-time intraoperative feedback to ensure optimal balloon dynamics and maximize pain relief. In the realm of spine surgery, two papers in the Journal of Neurosurgery: Spine challenge conventional approaches and post-operative assessment paradigms. First, Yan and colleagues introduce a surgical paradigm shift for the resection of cervical dumbbell tumors, which typically require extensive posterior facet joint resection and subsequent instrumented fusion [3]. The authors describe an outside-in lateral foraminal approach using an incision along the lateral border of the sternocleidomastoid muscle, corridor creation through the interscalene space, and direct visualization of the vertebral artery and brachial plexus. In their series of fifty-five patients, this minimally invasive approach achieved gross-total resection in one hundred percent of cases while completely preserving facet joint integrity, thereby eliminating the need for spinal fusion. Patients experienced significant neurological recovery, with mean Japanese Orthopaedic Association scores rising from thirteen point three to fifteen point one, and visual analog scale pain scores dropping from four point three to two point four. For patients undergoing lumbar spine surgery, we often rely on patient-reported outcome measures to gauge success, but a prospective multicenter study by Noroozi Gilandehi and colleagues reveals a major disconnect between what patients report and how much they actually move [6]. Using a smartphone application to track objective daily step counts in two hundred eighty-nine patients undergoing endoscopic lumbar decompression, the researchers found that while over seventy percent of patients achieved a clinically important difference in back and leg pain by two weeks, their objective step counts actually decreased significantly at this early postoperative stage. Step counts did not begin to increase until three months postoperatively, continuing to improve up to one year, even though pain scores remained flat after the initial two-week drop. Crucially, preoperative pain and disability scores did not predict postoperative physical activity, and post-operative pain scores did not correlate with daily step counts. Instead, the single best predictor of a patient's physical activity at one year was their preoperative step count. This highlights that pain relief does not automatically translate into immediate physical activity, and tracking objective step counts provides a distinct, independent measure of functional recovery that patient-reported questionnaires simply cannot capture.

Our final theme brings us to the difficult decisions surrounding geriatric head injury and the integration of artificial intelligence in neuro-oncology. In Acta Neurochirurgica, Aarhus and colleagues address the clinical dilemma of managing traumatic brain injury in patients aged eighty years and older [2]. In a cohort of six hundred eight patients with imaging-confirmed traumatic brain injury, only fourteen percent underwent neurosurgical intervention. The overall mortality was stark, with twenty-four percent dying within thirty days and forty-two percent within one year. While undergoing a neurosurgical intervention was associated with a roughly halved risk of death at thirty days, it did not translate into any survival benefit at one year, nor did it improve functional outcomes at six months, with favorable outcomes achieved in twenty-nine percent of the surgical group compared to thirty-four percent of the conservative group. Notably, acute craniotomies carried the highest mortality, whereas delayed trephination for chronic subdural hematomas was associated with a low five percent mortality and superior functional recovery. Ultimately, long-term outcomes were dominated by pre-injury factors, including age, American Society of Anesthesiologists physical status class, and pre-injury independence. This underscores the need for highly selective, patient-centered surgical decision-making in the oldest old, focusing on baseline function and realistic goals of care. Finally, we look at the future of neuro-oncology decision-making. Writing in the Journal of Neuro-Oncology, Reyes and colleagues conducted a systematic review of thirty studies evaluating artificial intelligence, machine learning, and deep learning models for prognosis and treatment stratification in glioblastoma [10]. Survival prediction was the most common task, with radiomics combined with conventional machine learning representing the most frequent model architecture. However, the authors sound a note of caution for clinicians: the current literature is highly heterogeneous, methodological reporting is inconsistent, and external validation was performed in fewer than seventeen percent of the analyzed studies. While artificial intelligence holds immense promise for personalized glioblastoma care, these findings indicate that the technology is not yet ready for routine clinical translation, and future research must focus on rigorous external validation across diverse patient datasets. We also note a JAMA publication tracking trends in patient portal messages and clinic encounters, highlighting how digital communication continues to reshape the administrative landscape of modern clinical practice [1].

If you only have time for one paper this week, make it the prospective study on pediatric ependymoma from the Journal of Neurosurgery: Pediatrics [7]. This paper is a powerful reminder of the fallibility of intraoperative surgeon assessment and demonstrates that routine, early central neuroradiological review coupled with aggressive, safe reoperation for residual disease can nearly double progression-free survival without increasing neurological deficits.

Here are the key takeaways from this week in Neurosurgery. First, in pediatric ependymoma, surgeons frequently misidentify residual disease as a gross-total resection; early central imaging review and subsequent reoperation are safe and significantly improve long-term survival. Second, late cerebrospinal fluid shunt infections occurring after six months are clinically distinct from early infections, are frequently associated with abdominal pseudocysts, and are often missed by standard cerebrospinal fluid cultures. Third, for elderly patients over eighty with traumatic brain injury, acute neurosurgical intervention reduces early mortality but does not improve one-year survival or six-month functional outcomes, which are primarily dictated by pre-injury baseline status. Fourth, patient-reported pain scores after lumbar decompression do not correlate with objective physical activity; monitoring daily step counts via mobile health tools offers a more reliable and independent measure of true functional recovery. And fifth, while vagus nerve stimulation is highly effective for refractory epilepsy, the greatest reduction in seizure frequency and medication burden is seen in patients with low baseline seizure frequencies of one to two events per month or year.

That's your roundup for This Week in Neurosurgery. The full transcript and references are available on the episode page in your AudioScholar library. This is an AI-curated summary — for clinical decisions, always consult primary sources and current guidelines. See you next week.

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