Efficacy and safety of minimally invasive surgery with thrombolysis in intracerebral haemorrhage evacuation (MISTIE III): a randomised, controlled, open-label, blinded endpoint phase 3 trial.

BACKGROUND: Acute stroke due to supratentorial intracerebral haemorrhage is associated with high morbidity and mortality. Open craniotomy haematoma evacuation has not been found to have any benefit in large randomised trials. We assessed whether minimally invasive catheter evacuation followed by thrombolysis (MISTIE), with the aim of decreasing clot size to 15 mL or less, would improve functional outcome in patients with intracerebral haemorrhage. METHODS: MISTIE III was an open-label, blinded endpoint, phase 3 trial done at 78 hospitals in the USA, Canada, Europe, Australia, and Asia. We enrolled patients aged 18 years or older with spontaneous, non-traumatic, supratentorial intracerebral haemorrhage of 30 mL or more. We used a computer-generated number sequence with a block size of four or six to centrally randomise patients to image-guided MISTIE treatment (1·0 mg alteplase every 8 h for up to nine doses) or standard medical care. Primary outcome was good functional outcome, defined as the proportion of patients who achieved a modified Rankin Scale (mRS) score of 0-3 at 365 days, adjusted for group differences in prespecified baseline covariates (stability intracerebral haemorrhage size, age, Glasgow Coma Scale, stability intraventricular haemorrhage size, and clot location). Analysis of the primary efficacy outcome was done in the modified intention-to-treat (mITT) population, which included all eligible, randomly assigned patients who were exposed to treatment. All randomly assigned patients were included in the safety analysis. This study is registered with ClinicalTrials.gov, number NCT01827046. FINDINGS: Between Dec 30, 2013, and Aug 15, 2017, 506 patients were randomly allocated: 255 (50%) to the MISTIE group and 251 (50%) to standard medical care. 499 patients (n=250 in the MISTIE group; n=249 in the standard medical care group) received treatment and were included in the mITT analysis set. The mITT primary adjusted efficacy analysis estimated that 45% of patients in the MISTIE group and 41% patients in the standard medical care group had achieved an mRS score of 0-3 at 365 days (adjusted risk difference 4% [95% CI -4 to 12]; p=0·33). Sensitivity analyses of 365-day mRS using generalised ordered logistic regression models adjusted for baseline variables showed that the estimated odds ratios comparing MISTIE with standard medical care for mRS scores higher than 5 versus 5 or less, higher than 4 versus 4 or less, higher than 3 versus 3 or less, and higher than 2 versus 2 or less were 0·60 (p=0·03), 0·84 (p=0·42), 0·87 (p=0·49), and 0·82 (p=0·44), respectively. At 7 days, two (1%) of 255 patients in the MISTIE group and ten (4%) of 251 patients in the standard medical care group had died (p=0·02) and at 30 days, 24 (9%) patients in the MISTIE group and 37 (15%) patients in the standard medical care group had died (p=0·07). The number of patients with symptomatic bleeding and brain bacterial infections was similar between the MISTIE and standard medical care groups (six [2%] of 255 patients vs three [1%] of 251 patients; p=0·33 for symptomatic bleeding; two [1%] of 255 patients vs 0 [0%] of 251 patients; p=0·16 for brain bacterial infections). At 30 days, 76 (30%) of 255 patients in the MISTIE group and 84 (33%) of 251 patients in the standard medical care group had one or more serious adverse event, and the difference in number of serious adverse events between the groups was statistically significant (p=0·012). INTERPRETATION: For moderate to large intracerebral haemorrhage, MISTIE did not improve the proportion of patients who achieved a good response 365 days after intracerebral haemorrhage. The procedure was safely adopted by our sample of surgeons. FUNDING: National Institute of Neurological Disorders and Stroke and Genentech.

Longitudinal Assessment of Developmental Outcomes in Infants Undergoing Late Craniosynostosis Repair.

Evaluation of infants with craniosynostosis for surgical intervention, as opposed to conservative management, remains a challenge within the field of craniofacial surgery. Studies have consistently demonstrated that surgical repair of craniosynostosis is ideally performed between 3 and 12 months of age. As such, there is limited data regarding neurocognitive development in infants who initially present with uncorrected craniosynostosis after 12 months of age. Moreover, the impact of cranial vault surgery on neurocognitive development at all ages remains under investigation. A prospective, nonrandomized study was performed. All children with nonsyndromic craniosynostosis who presented for initial evaluation after 12 months of age were enrolled. The Bayley Scales of Infant and Toddler Development, Third Edition (Bayley-III) was utilized to assess pre- and postoperative cognitive development and comparisons were made to normative values. Developmental delay is defined as scoring < 85. Five infants, average age 26 months (13-43 months) at initial presentation, underwent cranial vault remodeling and developmental testing. Fused cranial sutures involved: metopic (n = 4), and right coronal (n = 1). Cognitive testing demonstrated that 4 of 5 infants (80%) were developmentally delayed at presentation (scores: 60, 70, 72, and 80), and 1 infant was within normal limits (score: 100). Postoperative testing was performed between 2 and 12 months postoperatively. Universal improvement was observed in infants who were delayed prior to surgery (80, 80, 75, and 90, respectively). The infant who was not delayed prior to surgery remained within normal limits after surgery. This study demonstrates an association between cranial vault surgery and cognitive improvement in infants presenting late with developmental delay.

Classification and Microvascular Flap Selection for Anterior Cranial Fossa Reconstruction.

BACKGROUND: Microvascular reconstruction of the anterior cranial fossa (ACF) creates difficult challenges. Reconstructive goals and flap selection vary based on the defect location within the ACF. This study evaluates the feasibility and reliability of free tissue transfer for salvage reconstruction of low, middle, and high ACF defects. METHODS: A retrospective review was performed. Reconstructions were anatomically classified as low (anterior skull base), middle (frontal bar/sinus), and high (frontal bone/soft tissue). Subjects were evaluated based on pathologic indication and goal, type of flap used, and complications observed. RESULTS: Eleven flaps in 10 subjects were identified and anatomic sites included: low (n = 5), middle (n = 3), and high (n = 3). Eight of 11 reconstructions utilized osteocutaneous flaps including the osteocutaneous radial forearm free flap (OCRFFF) (n = 7) and fibula (n = 1). Other reconstructions included a split calvarial graft wrapped within a temporoparietal fascia free flap (n = 1), latissimus myocutaneous flap (n = 1), and rectus abdominis myofascial flap (n = 1). All 11 flaps were successful without microvascular compromise. No complications were observed in the high and middle ACF defect groups. Two of five flaps in the low defect group using OCRFFF flaps failed to achieve surgical goals despite demonstrating healthy flaps upon re-exploration. Complications included persistent cerebrospinal fluid leak (n = 1) and pneumocephalus (n = 1), requiring flap repositioning in one subject and a second microvascular flap in the second subject to achieve surgical goals. CONCLUSION: In our experience, osteocutaneous flaps (especially the OCRFFF) are preferred for complete autologous reconstruction of high and middle ACF defects. Low skull base defects are more difficult to reconstruct, and consideration of free muscle flaps (no bone) should be weighed as an option in this anatomic area.

A case series of dural venous sinus stenting in idiopathic intracranial hypertension: association of outcomes with optical coherence tomography.

Purpose/Aim: Pseudotumor cerebri or idiopathic intracranial hypertension (IIH) is characterized by increased intracranial pressure of unknown etiology. A subset of patients has shown benefit from endovascular dural venous sinus stenting (DVSS). We sought to identify a population of IIH patients who underwent DVSS to assess outcomes. MATERIALS AND METHODS: A retrospective study was performed to identify IIH patients with dural sinus stenosis treated with DVSS. Outcome measures included dural sinus pressure gradients, peripapillary retinal nerve fiber layer (RNFL) thickness using optical coherence tomography and improvement in symptoms. RESULTS: Seventeen patients underwent DVSS. Average pre- and post-intervention pressure gradients were 23.06 and 1.18 mmHg, respectively (p < 0.0001). Sixteen (94%) noted improvement in headache, fourteen (82%) had visual improvement and all (100%) patients had improved main symptom. Of 11 patients with optical coherence tomography, 8 showed decreased RNFL thickness and 3 remained stable; furthermore, these 11 patients had improved vision with improved papilledema in 8, lack of pre-existing papilledema in 2 and stable, mild edema in 1 patient. CONCLUSIONS: Our series of patients with dural sinus stenosis demonstrated improvement in vision and reduction in RNFL thickness. DVSS appears to be a useful treatment for IIH patients with dural sinus stenosis.

Linac-based stereotactic radiosurgery (SRS) in the treatment of refractory trigeminal neuralgia: Detailed description of SRS procedure and reported clinical outcomes.

PURPOSE/OBJECTIVES: To present our linac-based SRS procedural technique for medically and/or surgically refractory trigeminal neuralgia (TN) treatment and simultaneously report our clinical outcomes. MATERIALS AND METHODS: Twenty-seven refractory TN patients who were treated with a single fraction of 80 Gy to TN. Treatment delivery was performed with a 4 mm cone size using 7-arc arrangement with differential-weighting for Novalis-TX with six MV-SRS (1000 MU/min) beam and minimized dose to the brainstem. Before each treatment, Winston-Lutz quality assurance (QA) with submillimeter accuracy was performed. Clinical treatment response was evaluated using Barrow Neurological Institute (BNI) pain intensity score, rated from I to V. RESULTS: Out of 27 patients, 22 (81%) and 5 (19%) suffered from typical and atypical TN, respectively, and had median follow-up interval of 12.5 months (ranged: 1-53 months). For 80 Gy prescriptions, delivered total average MU was 19440 ± 611. Average beam-on-time was 19.4 ± 0.6 min. Maximum dose and dose to 0.5 cc of brainstem were 13.4 ± 2.1 Gy (ranged: 8.4-15.9 Gy) and 3.6 ± 0.4 Gy (ranged: 3.0-4.9 Gy), respectively. With a median follow-up of 12.5 months (ranged: 1-45 months) in typical TN patients, the proportion of patients achieving overall pain relief was 82%, of which half achieved a complete pain relief with BNI score of I-II and half demonstrated partial pain reduction with BNI score of IIIA-IIIB. Four typical TN patients (18%) had no response to radiosurgery treatment. Of the patients who responded to treatment, actuarial pain recurrence free survival rates were approximately 100%, 75%, and 50% at 12 months, 15 months, and 24 months, respectively. Five atypical TN patients were included, who did not respond to treatment (BNI score: IV-V). However, no radiation-induced cranial-toxicity was observed in all patients treated. CONCLUSION: Linac-based SRS for medically and/or surgically refractory TN is a fast, effective, and safe treatment option for patients with typical TN who had excellent response rates. Patients, who achieve response to treatment, often have durable response rates with moderate actuarial pain recurrence free survival. Longer follow-up interval is anticipated to confirm our clinical observations.

The relationship of pro-inflammatory markers to vascular endothelial function after acute stroke.

Purpose/Aim: Data from chronic stroke studies have reported reduced blood flow and vascular endothelial function in the stroke-affected limb. It is unclear whether these differences are present early after stroke. First, we investigated whether vascular endothelial function in the stroke-affected limb would be different from healthy adults. Second, we examined whether between-limb differences in vascular endothelial function existed in the stroke-affected arm compared to the non-affected arm. Last, we tested whether reduced vascular endothelial function was related to pro-inflammatory markers that are present early after stroke. MATERIALS AND METHODS: Vascular endothelial function was assessed by flow-mediated dilation (FMD) in the brachial artery within 72 h post-stroke. All participants withheld medications from midnight until after the procedure. Ultrasound scans and blood draws for pro-inflammatory markers occurred on the same day between 7:30 am and 9:00 am. RESULTS: People with acute stroke had significantly lower FMD (4.2% ± 4.6%) than control participants (8.5% ± 5.2%, p = 0.037). Stroke participants had between-limb differences in FMD (4.2% ± 4.6% stroke-affected vs. 5.3% ± 4.4% non-affected, p = 0.02), whereas, the control participants did not. Of the pro-inflammatory markers, only vascular cell adhesion molecule-1(VCAM-1) had a significant relationship to FMD (stroke-affected limb, r = -0.62, p = 0.03; non-affected limb, r = -0.75, p = 0.005), but not tumor necrosis factor alpha nor interleukin-6. CONCLUSIONS: Vascular endothelial function is reduced starting in the early stage of stroke recovery. People with higher levels of VCAM-1 had a lower FMD response.

Metastatic prostate carcinoma to the orbit as the first presentation of disease.

Prostate carcinoma is a common tumor of the older adult male. It is associated with bony metastases, particularly to the axial skeleton. We present two case histories; in both cases, the patients had no prior history of prostate carcinoma. Both cases were diagnosed with CT imaging, elevated PSA, and biopsy. Additionally, they were treated with surgical resection and hormone modulation therapy. While bony metastases are frequently associated with advanced disease, they can also be a cause of presenting symptoms. The CT imaging in these two cases showed the classic hyperostotic findings of prostate cancer. Prostate cancer may cause osteoblastic lesions in contrast to other metastatic bone lesions, which cause destructive osteolytic lesions. During excisional surgery, the tumor was inspected and many stalactite-like lesions were present on the gross sample. We present these and compare them to the CT imaging.

Intracerebral laser interstitial thermal therapy followed by tumor resection to minimize cerebral edema.

OBJECTIVE Laser interstitial thermal therapy (LITT) is used in numerous neurosurgical applications including lesions that are difficult to resect. Its rising popularity can be attributed to its minimally invasive approach, improved accuracy with real-time MRI guidance and thermography, and enhanced control of the laser. One of its drawbacks is the possible development of significant edema, which contributes to extended hospital stays and often necessitates hyperosmolar or steroid therapy. Here, the authors discuss the use of minimally invasive craniotomy to resect tissue ablated with LITT in attempt to minimize cerebral edema. METHODS Five patients with glioblastoma multiforme prospectively underwent LITT followed by resection. The LITT was performed with the aid of an MR-compatible skull-mounted frame in the MRI suite. Ablated tumor was then resected via small craniotomy by using the NICO Myriad system or cavitron ultrasonic surgical aspirator. Postoperative management involved dexamethasone administration slowly tapered over several weeks. RESULTS The use of resection following LITT, as compared with open resection or LITT alone, did not extend the hospital stay except in 1 patient who required 3-day inpatient management of edema with a trapped ventricle. No new neurological deficits were encountered, although 1 patient developed seizures postoperatively. No increase in infection rates was identified. CONCLUSIONS Resection of ablated tumor is a viable option to reduce the incidence of neurological deficits due to edema following LITT. This approach appears to mitigate cerebral edema by increasing available volume for mass effect and reducing the tissue burden that may promote an inflammatory response.

A Plausible Historical and Forensic Account of the Death of Thomas Aquinas.

Thomas Aquinas (1225-1274) was an influential medieval Christian theologian and arguably one of the greatest scholastic philosophers. He produced more than 60 works in his 48 years, including his magnum opus, the Summa Theologica. The Catholic Church regards him as a canonized saint and one of 37 Doctors of the Church. On his way to an ecumenical council in 1274, he was "struck with sudden illness" requiring rest at a monastery where he was cared for until death several weeks later. An obscure Latin text describes an incident where he hit his head violently on an overhanging branch. Becoming progressively ill, he arrived at a Cistercian abbey where he died on March 7. Through an analysis of his final illness as documented in key Latin and Italian historical texts, and careful observation of the reputed skull relic in Priverno, Italy, the authors postulate that Aquinas may have suffered a traumatic brain injury and that his death at age 48 was occasioned by a chronic subdural hematoma. Examination of the skull was inconclusive; however, the historical textual analysis supports this theory. A more in-depth forensic analysis of the skull may help confirm the diagnosis.

Geo-demographic trends in nontraumatic subarachnoid hemorrhage-related mortality among older adults in the United States, 1999-2020.

Introduction: Nontraumatic subarachnoid hemorrhage (ntSAH) often results from a ruptured aneurysm and correlates with significant morbidity and mortality, particularly among the older population. Despite its impact, limited comprehensive studies evaluate the longitudinal trends in ntSAH-related mortality in older adults in the United States (US). Methods: The authors conducted a retrospective analysis using the CDC WONDER database from 1999 to 2020, analyzing Multiple Cause-of-Death Public Use death certificates to identify ntSAH as a contributing factor in the death of adults aged 65 years and older. We calculated age-adjusted mortality rates (AAMR) and annual percent change (APC) to examine trends across demographic variables such as sex, race/ethnicity, urbanization, and states/census region. Results: A total of 78,260 ntSAH-related deaths (AAMR 8.50 per 100,000 individuals) occurred among older adults in the US from 1999 to 2020. The overall AAMR for ntSAH decreased from 9.98 in 1999 to 8.67 in 2020 with an APC of -0.7% [95% CI (-1.0, -0.3)]. However, the authors observed a noticeable rise from 2013 to 2020 with an APC of 1.7% [95% CI (0.8, 2.6)]. Sex, racial, and regional disparities were evident with higher mortality rates for ages 85 or greater (crude mortality rate 16.6), women (AAMR 9.55), non-Hispanic Asian or Pacific Islander (AAMR 12.5), and micropolitan areas (AAMR 8.99), and Western US (AAMR 8.65). Conclusion: Mortality from ntSAH increases with age, affects women disproportionately, and occurs more often in an inpatient setting. These findings necessitate targeted, multi-dimensional health policies and clinical interventions. Specialties beyond neurosurgery can utilize this data for improved risk stratification and early treatment. Policymakers should focus on equitable resource allocation and community-level interventions to mitigate these trends effectively.

The Legacy of Harrington's Rod and the Evolution of Long-Segment Constructs in Spine Surgery.

This paper delves into the historical evolution of spinal surgery, focusing on the pivotal role of the Harrington rod in treating spinal deformities. Introduced in 1955, the Harrington rod marked a significant breakthrough in neurosurgery, especially for scoliosis treatment, by offering a novel approach to spinal stabilization. Through a retrospective analysis, this study examines the development and impact of the Harrington rod, highlighting Dr. Paul Harrington's contributions to spinal surgery. His innovative technique revolutionized the management of spinal deformities, laying the groundwork for future advancements in spinal instrumentation. Despite initial skepticism, Harrington's methods gained acceptance, significantly influencing neurosurgical practices and patient outcomes. This study also explores subsequent advancements that built on Harrington's work, including the transition to long-segment spine constructs and the introduction of segmental pedicle screws, which allowed for more precise deformity correction. Reflecting on Harrington's legacy, this paper acknowledges the continuous evolution of spinal surgery, driven by the interplay between clinical challenges and technological innovations. Harrington's pioneering spirit exemplifies the ongoing pursuit of better surgical outcomes, underscoring the importance of innovation in the field of neurosurgery.

Extra-Axial Cavernous Angioma: A Case Report and Review of the Literature.

Cavernous angiomas (CAs) are benign vascular malformations predominantly seen in the brain parenchyma and therefore referred to as intra-axial. Extra-axial dural-based cavernous angiomas, on the other hand, are rare vascular lesions found outside of the brain parenchyma. They occur in the middle fossa and may be easily misdiagnosed as meningiomas due to their extra-axial location. In addition, CAs that are located outside the middle fossa, such as in the convexity, have a better prognosis since they are more surgically accessible. Surgical resection is the main treatment of choice in CAs. However, other options, such as embolization and radiotherapy, may also be considered therapeutic choices or additive treatment options. The pathogenesis of CA and the involvement of other factors (genetics or environmental factors) are still unknown and require further investigation. We are presenting a young man who presented for evaluation of seizure-like events without any family history of neurologic conditions. The physical examination was unremarkable except for a slightly antalgic gait. Imaging studies showed an extra-axial left tentorial mass suggestive of a meningioma, hemangiopericytoma, or other extra-axial lesions. The lesion was resected where its vascular nature was mentioned initially, and the histology proved the diagnosis of cavernous angioma. Here we give an overview of the known pathogenesis, causes, clinical features, and diagnostic and therapeutic options in CA. Better knowledge about CA, its causes, clinical features, and treatment options would help clinicians in early diagnosis and patient management.

Association of geographical disparities and segregation in regional treatment facilities for Black patients with aneurysmal subarachnoid hemorrhage in the United States.

Background and objectives: This study investigates geographic disparities in aneurysmal subarachnoid hemorrhage (aSAH) care for Black patients and aims to explore the association with segregation in treatment facilities. Understanding these dynamics can guide efforts to improve healthcare outcomes for marginalized populations. Methods: This cohort study evaluated regional differences in segregation for Black patients with aSAH and the association with geographic variations in disparities from 2016 to 2020. The National Inpatient Sample (NIS) database was queried for admission data on aSAH. Black patients were compared to White patients. Segregation in treatment facilities was calculated using the dissimilarity (D) index. Using multivariable logistic regression models, the regional disparities in aSAH treatment, functional outcomes, mortality, and end-of-life care between Black and White patients and the association of geographical segregation in treatment facilities was assessed. Results: 142,285 Black and White patients were diagnosed with aSAH from 2016 to 2020. The Pacific division (D index = 0.55) had the greatest degree of segregation in treatment facilities, while the South Atlantic (D index = 0.39) had the lowest. Compared to lower segregation, regions with higher levels of segregation (global F test p < 0.001) were associated a lower likelihood of mortality (OR 0.91, 95% CI 0.82-1.00, p = 0.044 vs. OR 0.75, 95% CI 0.68-0.83, p < 0. 001) (p = 0.049), greater likelihood of tracheostomy tube placement (OR 1.45, 95% CI 1.22-1.73, p < 0.001 vs. OR 1.87, 95% CI 1.59-2.21, p < 0.001) (p < 0. 001), and lower likelihood of receiving palliative care (OR 0.88, 95% CI 0.76-0.93, p < 0.001 vs. OR 0.67, 95% CI 0.59-0.77, p < 0.001) (p = 0.029). Conclusion: This study demonstrates regional differences in disparities for Black patients with aSAH, particularly in end-of-life care, with varying levels of segregation in regional treatment facilities playing an associated role. The findings underscore the need for targeted interventions and policy changes to address systemic healthcare inequities, reduce segregation, and ensure equitable access to high-quality care for all patients.

Ultrasound localization of a tunneled leech beneath a microvascular scalp reconstruction: A case report.

Medicinal leech therapy is a common adjuvant modality used to treat venous congestion following threatened microvascular anastomosis. Migration and tunneling of a leech beneath a surgical reconstruction is a rare event that is seldom mentioned in the literature and worthy of further discussion. We present a rectus abdominus myocutaneous free tissue transfer that was used to cover a large alloplastic cranioplasty following resection of a previously radiated skull base malignant meningioma. The flap became congested postoperatively and required leech therapy after surgical salvage. Three days after flap salvage, the subject was once again brought back to the operating room for surgical exploration when a leech was witnessed to migrate beneath the threatened free flap. Duplex ultrasound was used intra-operatively to localize the leech 12 cm from its bite and assist with its successful removal. Tunneling of the leech beneath the flap is a rare complication, and localization underneath a myofascial or myocutaneous flap may be difficult. Duplex ultrasound is a simple and reliable method to localize the leech and allow for its removal through a minimal access incision.

Advances in computational and translational approaches for malignant glioma.

Gliomas are the most common primary brain tumors in adults and carry a dismal prognosis for patients. Current standard-of-care for gliomas is comprised of maximal safe surgical resection following by a combination of chemotherapy and radiation therapy depending on the grade and type of tumor. Despite decades of research efforts directed towards identifying effective therapies, curative treatments have been largely elusive in the majority of cases. The development and refinement of novel methodologies over recent years that integrate computational techniques with translational paradigms have begun to shed light on features of glioma, previously difficult to study. These methodologies have enabled a number of point-of-care approaches that can provide real-time, patient-specific and tumor-specific diagnostics that may guide the selection and development of therapies including decision-making surrounding surgical resection. Novel methodologies have also demonstrated utility in characterizing glioma-brain network dynamics and in turn early investigations into glioma plasticity and influence on surgical planning at a systems level. Similarly, application of such techniques in the laboratory setting have enhanced the ability to accurately model glioma disease processes and interrogate mechanisms of resistance to therapy. In this review, we highlight representative trends in the integration of computational methodologies including artificial intelligence and modeling with translational approaches in the study and treatment of malignant gliomas both at the point-of-care and outside the operative theater in silico as well as in the laboratory setting.

Analysis of Imaging Results for Semisitting Compared with Supine Positioning in the Retrosigmoid Approach for Resection of Cerebellopontine Angle Vestibular Schwannomas.

OBJECTIVE: To compare the completeness of resection of vestibular schwannomas using three-dimensional segmented volumetric analysis of pre- and postoperative magnetic resonance imaging (MRI) of patients undergoing supine and semisitting positioning for the retrosigmoid approach. STUDY DESIGN: Retrospective chart review. SETTING: Tertiary medical center. PATIENTS: Patients with vestibular schwannomas undergoing surgical resection via the retrosigmoid approach. INTERVENTIONS: Tumor resection via the retrosigmoid approach with different patient positioning: standard supine versus semisitting. MAIN OUTCOME MEASURES: Preoperative versus postoperative three-dimensional segmented volumetric MRI analysis of vestibular schwannomas. RESULTS: A total of 43 patients (15 supine and 28 semisitting) underwent retrosigmoid craniotomy for resection of vestibular schwannomas. For the conventional supine and semisitting positioning, mean preoperative tumor volumes were 12.65 and 8.73 cm 3 ( p = 0.15), respectively. Postoperative mean tumor volumes for the supine and semisitting positions were 2.09 and 0.48 cm 3 ( p = 0.13), respectively. There were 11 cases of postoperative sigmoid sinus thrombosis, 3 in the conventional supine group and 8 in the semisitting groups, and there were 6 cases of postoperative cerebrospinal fluid leaks, all in the semisitting group. The mean House-Brackmann scores for the supine and semisitting groups were 2.9 and 2.3, respectively. There was no statistically significant difference between groups in the rates of these or any other postoperative complications. CONCLUSIONS: The semisitting position for the suboccipital retrosigmoid approach for vestibular schwannoma resection does not compromise the ability to adequately resect the tumor as seen by volumetric MRI results. Further studies are needed to establish the safety of this position compared with the traditional supine approach.

Race and socioeconomic disparities in mortality and end-of-life care following aneurysmal subarachnoid hemorrhage.

BACKGROUND: This study explores racial and socioeconomic disparities in aneurysmal subarachnoid hemorrhage (aSAH) care, highlighting the impact on treatment and outcomes. The study aims to shed light on inequities and inform strategies for reducing disparities in healthcare delivery. METHODS: In this cohort study the National Inpatient Sample database was queried for patient admissions with ruptured aSAH from 2016 to 2020. Multivariable analyses were performed estimating the impact of socioeconomic status and race on rates of acute treatment, functional outcomes, mortality, receipt of life-sustaining interventions (mechanical ventilation, tracheostomy, gastrostomy, and blood transfusions), and end-of-life care (palliative care and do not resuscitate). RESULTS: A total of 181 530 patients were included. Minority patients were more likely to undergo treatment (OR 1.15, 95% CI 1.09 to 1.22, P<0.001) and were less likely to die (OR 0.89, 95% CI 0.84 to 0.95, P<0.001) than White patients. However, they were also more likely to have a tracheostomy (OR 1.47, 95% CI 1.33 to 1.62, P<0.001) and gastrostomy tube placement (OR 1.43, 95%CI 1.32 to 1.54, P<0.001), while receiving less palliative care (OR 0.75, 95% CI 0.70 to 0.80, P<0.001). This trend persisted when comparing minority patients from wealthier backgrounds with White patients from poorer backgrounds for treatment (OR 1.10, 95% CI 1.00 to 1.21, P=0.046), mortality (OR 0.82, 95% CI 0.74 to 0.89, P<0.001), tracheostomy tube (OR 1.27, 95% CI 1.07 to 1.48, P<0.001), gastrostomy tube (OR 1.34, 95% CI 1.18 to 1.52, P<0.001), and palliative care (OR 0.76, 95% CI 0.69 to 0.84, P<0.001). CONCLUSIONS: Compared with White patients, minority patients with aSAH are more likely to undergo acute treatment and have lower mortality, yet receive more life-sustaining interventions and less palliation, even in higher socioeconomic classes. Addressing these disparities is imperative to ensure equitable access to optimal care and improve outcomes for all patients regardless of race or class.

Collateral damage: heat transfer as a possible mechanism of optic nerve injury during neurosurgical intervention.

PURPOSE: To determine factors associated with increased heat transfer during neurosurgical drilling as a mechanism for optic nerve injury. METHODS: On a nonembalmed cadaver, the optic canal was exposed through a standard craniotomy and optic nerve sparing exenteration. The temperature was measured with a thermocoupler during each 30-second continuous drill session using 2 types of neurosurgical drills. The location of the probe, drill site, drill power, and irrigation rate were varied. RESULTS: A <1 °C change was measured in the optic canal at all test distances with the Cavitron Ultrasonic Surgical Aspirator and diamond drill. The use of manual irrigation decreased the mean change in temperature (ΔT) in the sphenoid bone from 4.7 °C without irrigation to 1.3 °C with irrigation. Increasing Cavitron Ultrasonic Surgical Aspirator power from 50% to 80% at an irrigation rate of 4 ml/minute more than doubled ΔT in sphenoid bone from 3.2 °C at 50% to 8.1 °C at 80%. Increasing irrigation from 2 to 4 ml/minute decreased mean ΔT by -1.1 °C (3.2 °C at 2 ml/minute versus 2.1 °C at 4 ml/minute) at Cavitron Ultrasonic Surgical Aspirator power of 50%, but at Cavitron Ultrasonic Surgical Aspirator power of 80%, increasing irrigation increased mean ΔT by 3.0 °C (3.7 °C at 2 ml/minute versus 6.8 °C at 4 ml/minute). CONCLUSIONS: Care must be taken during neurosurgical procedures to decrease heat transfer during drilling to nearby structures. With increase in drill power, there is a noticeable increase in temperature change from baseline. These temperature changes can be mediated by irrigation, although the effect of increasing irrigation rate to suppress the raise in temperature decreases with increasing drill power.

Intracranial tuberculoma: a rare complication of extrapulmonary tuberculosis. Illustrative case.

BACKGROUND: Intracranial tuberculomas are rare entities commonly seen only in low- to middle-income countries where tuberculosis remains endemic. Furthermore, following adequate treatment, the development of intracranial spread is uncommon in the absence of immunosuppression. OBSERVATIONS: A 22-year-old man with no history of immunosuppression presented with new-onset seizures in the setting of miliary tuberculosis status post 9 months of antitubercular therapy. Following a 2-month period of remission, he presented with new-onset tonic-clonic seizures. Magnetic resonance imaging demonstrated interval development of a mass concerning for an intracranial tuberculoma. After resection, pathological analysis of the mass revealed caseating granulomas within the multinodular lesion, consistent with intracranial tuberculoma. The patient was discharged after the reinitiation of antitubercular medications along with a steroid taper. LESSONS: To the best of the authors' knowledge, this case represents the first instance of intracranial tuberculoma occurring after the initial resolution of a systemic tuberculosis infection. The importance of retaining a high level of suspicion when evaluating these patients for seizure etiology is crucial because symptoms are rapidly responsive to resection of intracranial tuberculoma masses. Furthermore, it is imperative for surgeons to recognize the isolation steps necessary when managing these patients within the operating theater and inpatient settings.

Outcomes and Utility of Intracranial Free Tissue Transfer.

OBJECTIVE: Complications associated with intracranial vault compromise can be neurologically and systemically devastating. Primary and secondary repair of these deficits require an air and watertight barrier between the intracranial and extracranial environments. This study evaluated the outcomes and utility of using intracranial free tissue transfer as both primary and salvage surgical repair of reconstruction. METHODS: A retrospective review was performed of all subjects who underwent intracranial free tissue transfer as primary or salvage repair. RESULTS: A total of 13 intracranial free tissue transfers were performed on 11 subjects: osteocutaneous radial forearm free flaps (n = 6), partial myofascial rectus abdominis flaps (n = 5), temporoparietal fascia flap (n = 1), and serratus anterior myofascial flap (n = 1). Primary reconstruction was performed on 4 subjects with the remaining being salvage repair. Indications for surgery included neoplasm (n = 6 of 11), ballistic trauma (n = 3 of 11), motor vehicle accident (n = 1 of 11), and infection (n = 1 of 11). Three subjects required additional surgical repair for CSF leak and pneumocephalus, with 2 subjects requiring an additional free tissue transfer at a different site. CONCLUSION: In our experience, free tissue transfer is an effective primary and salvage surgical technique in the reconstruction of complex intracranial problems.