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BACKGROUND Symptomatic neonatal subdural hematomas usually result from head trauma incurred during vaginal delivery, most commonly during instrument assistance. Symptomatic subdural hematomas are rare in C-section deliveries that were not preceded by assisted delivery techniques. Although the literature is inconclusive, another possible cause of subdural hematomas is therapeutic hypothermia. CASE SUMMARY We present a case of a term neonate who underwent therapeutic whole-body cooling for hypoxic ischemic encephalopathy following an emergent C-section delivery for prolonged decelerations. Head ultrasound on day of life 3 demonstrated a rounded mass in the posterior fossa. A follow-up brain magnetic resonance imaging confirmed hypoxic ischemic encephalopathy and clarified the subdural hematomas in the posterior fossa causing mass effect and obstructive hydrocephalus. CONCLUSION The aim of this report is to highlight the rarity and importance of mass-like subdural hematomas causing obstructive hydrocephalus, particularly in the setting of hypoxic ischemic encephalopathy and therapeutic whole-body cooling.

Primary Objective: The purpose of this study was to determine the utility of CT imaging in patients with non-operative mild-moderate TBI with respect to changes in management.Methods: We conducted a retrospective analysis for 191 patients over a 5-year interval to examine whether follow-up CT initiated a change in management. We created a logistic regression model to incorporate different variables contributing to change in management.Results: Of 191 patients, 31 (16.2%) underwent a change in management. Change in management was associated with older age (65 yo vs. 55 yo, p = .011), diagnosis of subdural hematoma (p = .041), antiplatelet/anticoagulant therapy (p = .009), imaging performed (p = .16), and increased blood products on CT (p =

Highlights • UPSC has a higher tendency for distant metastasis compared to other histologies. • Intracranial metastasis occurs in less than 1% of endometrial cancer cases. • Multimodal therapy is associated with improved outcomes for intracranial UPSC., Uterine papillary serous carcinoma (UPSC) is a highly aggressive endometrial cancer histology with a propensity for distant metastasis. Despite the aggressive nature of UPSC, central nervous system metastasis is a rare occurrence with few cases reported in the literature. We present a case of a 58-year-old woman with a history of Stage IIIA UPSC who was diagnosed with recurrent, metastatic disease in the pineal gland more than 6 years after her initial diagnosis.

Background and objectives Patient experience has become a quality measure in hospitals across the United States. To improve our understanding of our neurosurgical patient population's satisfaction needs, we undertook a detailed survey to identify areas of needed improvement. Methods Upon institutional review board approval, a detailed survey adopted from the Swedish quality-of-care patient questionnaire was distributed to all patients being discharged from the neurosurgical ward over a month period. From June 2014 to July 2014, all patients admitted to the neurosurgery service through the emergency department, clinic, or other facilities were enrolled. There were no specific inclusion criteria except for age older than 18 years, intact cognition to complete the survey, and return of a completed survey. Data were collected in 6 major categories, including information availability, patient accessibility, treatment received, caring perception, hospital environment, and overall satisfaction. Patients were evaluated by age, gender, surgery, and admission type. Results Our analysis demonstrated an improved overall satisfaction in those patients being admitted electively from the clinic as compared with emergency department admissions or hospital transfers. In addition, patients admitted on an emergent basis reported a lower satisfaction pertaining to receiving information, specifically test results. Conclusions Emergent admissions represent a subpopulation that may require additional strategies to improve patient satisfaction survey scores.

Cervical spine injuries, and specifically spinal cord injuries (SCI), represent a small fraction of the pathologies that occur within football. Though infrequent, appropriate recognition and proper management reduce the likelihood of progression of a neurological injury and improve chances of recovery. Therefore, we will introduce cervical spine injuries in football first by understanding their incidence and how they have been affected by specific rule changes. It is then pertinent for the treating provider of a football player with a suspected SCI to understand the essential on-field assessment, further detailed evaluation, and management that should be performed. We will then review some basic tenants of common cervical spine pathologies and provide an overview of general return-to-play guidelines in these athletes. Lastly, we will attempt to tackle the conundrum that exists for counseling athletes found to have incidental cervical spine processes such as cervical stenosis, Klippel-Feil syndrome, and Chiari malformation.

Cortical tubers associated with tuberous sclerosis complex (TSC) are potential epileptic foci that are often amenable to resective or ablative surgeries, and controlling seizures at a younger age may lead to improved functional outcomes. MRI-guided laser interstitial thermal therapy (MRgLITT) has become a popular minimally invasive alternative to traditional craniotomy. Benefits of MRgLITT include the ability to monitor the ablation in real time, a smaller incision, shorter hospital stay, reduced blood loss, and reduced postoperative pain. To place the laser probe for LITT, however, stereotaxy is required—which classically involves head fixation with cranial pins. This creates a relative minimum age limit of 2 years old because it demands a mature skull and fused cranial sutures. A novel technique is presented for the application of MRgLITT in a 6-month-old infant for the treatment of epilepsy associated with TSC. To the authors’ knowledge this is the youngest patient treated with laser ablation. The authors used a frameless navigation technique with a miniframe tripod system and intraoperative reference points. This technique expands the application of MRgLITT to younger patients, which may lead to safer surgical interventions and improved outcomes for these children.

OBJECTIVEWhile guidelines exist for many neurosurgical procedures, external ventricular drain (EVD) insertion has yet to be standardized. The goal of this study was to survey the neurosurgical community and determine the most frequent EVD insertion practices. The hypothesis was that there would be no standard practices identified for EVD insertion or methods to avoid EVD-associated infections.METHODSThe American Association of Neurological Surgeons membership database was queried for all eligible neurosurgeons. A 16-question, multiple-choice format survey was created and sent to 7217 recipients. The responses were collected electronically, and the descriptive results were tabulated. Data were analyzed using the chi-square test.RESULTSIn total, 1143 respondents (15.8%) completed the survey, and 705 respondents (61.6%) reported tracking EVD infections at their institution. The most common self-reported infection rate ranged from 1% to 3% (56.1% of participants), and 19.7% of respondents reported a 0% infection rate. In total, 451 respondents (42.7%) indicated that their institution utilizes a formal protocol for EVD placement. If a respondent's institution had a protocol, only 258 respondents (36.1%) always complied with the protocol. Protocol utilization for EVD insertion was significantly more frequent among residents, in academic/hybrid centers, in ICU settings, and if the institution tracked EVD-associated infection rates (p < 0.05). A self-reported 0% infection rate was significantly more commonly associated with a higher level of training (e.g., attending physicians), private center settings, a clinician performing 6 to 10 EVD insertions within the previous 12 months, and prophylactic continuous antibiotic utilization (p < 0.05).CONCLUSIONSThis survey demonstrated heterogeneity in the practices for EVD insertion. No standard practices have been proposed or adopted by the neurosurgical community for EVD insertion or complication avoidance. These results highlight the need for the nationwide standardization of technique and complication prevention measures.

OBJECTThe long-term consequences of atlantoaxial (AA) and occipitocervical (OC) fusion and instrumentation in young children are unknown. Anecdotal reports have raised concerns regarding altered growth and alignment of the cervical spine after surgical intervention. The purpose of this study was to determine the long-term effects of these surgeries on the growth and alignment of the maturing spine.METHODSA multiinstitutional retrospective chart review was conducted for patients less than or equal to 6 years of age who underwent OC or AA fusion with rigid instrumentation at 9 participating centers. All patients had at least 3 years of clinical and radiographic follow-up data and radiographically confirmed fusion. Preoperative, immediate postoperative, and most recent follow-up radiographs and/or CT scans were evaluated to assess changes in spinal growth and alignment.RESULTSForty children (9 who underwent AA fusion and 31 who underwent OC fusion) were included in the study (mean follow-up duration 56 months). The mean vertical growth over the fused levels in the AA fusion patients represented 30% of the growth of the cervical spine (range 10%–50%). Three different vertical growth patterns of the fusion construct developed among the 31 OC fusion patients during the follow-up period: 1) 16 patients had substantial growth (13%–46% of the total growth of the cervical spine); 2) 9 patients had no meaningful growth; and 3) 6 patients, most of whom presented with a distracted atlantooccipital dislocation, had a decrease in the height of the fused levels (range 7–23 mm). Regarding spinal alignment, 85% (34/40) of the patients had good alignment at follow-up, with straight or mildly lordotic cervical curvatures. In 1 AA fusion patient (11%) and 5 OC fusion patients (16%), we observed new hyperlordosis (range 43°–62°). There were no cases of new kyphosis or swan-neck deformity, evidence of subaxial instability, or unintended subaxial fusion. No preoperative predictors of these growth patterns or alignment were evident.CONCLUSIONSThese results demonstrate that most young children undergoing AA and OC fusion with rigid internal fixation continue to have good cervical alignment and continued growth within the fused levels during a prolonged follow-up period. However, some variability in vertical growth and alignment exists, highlighting the need to continue close long-term follow-up.

In an era of residency duty-hour restrictions, there has been a recent effort to implement simulation-based training methods in neurosurgery teaching institutions. Several surgical simulators have been developed, ranging from physical models to sophisticated virtual reality systems. To date, there is a paucity of information describing the clinical benefits of existing simulators and the assessment strategies to help implement them into neurosurgical curricula. Here, we present a systematic review of the current models of simulation and discuss the state-of-the-art and future directions for simulation in neurosurgery. Retrospective literature review. Multiple simulators have been developed for neurosurgical training, including those for minimally invasive procedures, vascular, skull base, pediatric, tumor resection, functional neurosurgery, and spine surgery. The pros and cons of existing systems are reviewed. Advances in imaging and computer technology have led to the development of different simulation models to complement traditional surgical training. Sophisticated virtual reality (VR) simulators with haptic feedback and impressive imaging technology have provided novel options for training in neurosurgery. Breakthrough training simulation using 3D printing technology holds promise for future simulation practice, proving high-fidelity patient-specific models to complement residency surgical learning.

BACKGROUND: The Agency for Healthcare Research and Quality patient safety indicators (PSIs) and Centers for Medicare and Medicaid Services hospital-acquired conditions (HACs) are publicly reported metrics that illustrate the overall quality of care provided at an institution. The national incidences of PSIs and HACs in traumatic brain injury (TBI) patients were estimated using the Nationwide Inpatient Sample database. OBJECTIVE: To establish baseline incidences of PSIs and HACs among surgical TBI patients treated at nonfederal hospitals in the United States, and to identify patient factors contributing to these adverse events. METHODS: The Nationwide Inpatient Sample database was queried for patients admitted with International Classification of Diseases, Ninth Revision diagnosis codes consistent with TBI between 2002 and 2011. The incidences of PSIs and HACs were estimated for TBI patients and evaluated for correlation with multiple factors, including comorbidity score, teaching hospital status, and insurance status. RESULTS: There were 15403 total PSIs among 24012 TBI patients. There were only 165 HACs among 24012 TBI patients. Only sepsis, deep vein thrombosis, and pressure ulcers occurred in more than 1% of patients. Patient age, sex, comorbidity score, and teaching hospital status were all found to significantly impact PSI incidence. Comorbidity score was found to significantly impact HAC incidence. Compared with private insurance, Medicaid patients developed significantly more HACs. CONCLUSION: These data may be used as reference values for hospitals reporting their own rates and seeking to improve the quality of care they provide for TBI patients. ABBREVIATIONS: AHRQ, Healthcare Research and QualityHAC, hospital-acquired conditionICP, intracranial pressureLOS, length of stayMS-DRG, Medicare Severity Diagnosis Related GroupNIS, Nationwide Inpatient SamplePSI, patient safety indicatorTBI, traumatic brain injury. Language: en

Amyotrophic lateral sclerosis (ALS) is a clinically heterogeneous disorder characterized by loss of motor neurons, resulting in paralysis and death. Multiple mechanisms of motor neuron injury have been implicated based upon the more than 20 different genetic causes of familial ALS. These inherited mutations compromise diverse motor neuron pathways leading to cell-autonomous injury. In the ALS transgenic mouse models, however, motor neurons do not die alone. Cell death is noncell-autonomous dependent upon a well orchestrated dialogue between motor neurons and surrounding glia and adaptive immune cells. The pathogenesis of ALS consists of 2 stages: an early neuroprotective stage and a later neurotoxic stage. During early phases of disease progression, the immune system is protective with glia and T cells, especially M2 macrophages/microglia, and T helper 2 cells and regulatory T cells, providing anti-inflammatory factors that sustain motor neuron viability. As the disease progresses and motor neuron injury accelerates, a second rapidly progressing phase develops, characterized by M1 macrophages/microglia, and proinflammatory T cells. In rapidly progressing ALS patients, as in transgenic mice, neuroprotective regulatory T cells are significantly decreased and neurotoxicity predominates. Our own therapeutic efforts are focused on modulating these neuroinflammatory pathways. This review will focus on the cellular players involved in neuroinflammation in ALS and current therapeutic strategies to enhance neuroprotection and suppress neurotoxicity with the goal of arresting the progressive and devastating nature of ALS.

Idiopathic intracranial hypertension (IIH), formerly known as pseudotumor cerebri, is a disease of elevated intracranial pressure that is thought to develop due to impaired CSF absorption related to elevated venous sinus pressure in the setting of increased intraabdominal and thoracic pressures. Symptoms can be disabling and, if left untreated, can lead to permanent visual loss. Previous treatments directed toward vision preservation include CSF diversion through shunting and optic nerve sheath fenestration. Recently, attention has been turned toward surgical weight loss strategies as an alternative to shunt treatment. The authors present a report of 3 patients with adolescent-onset IIH that was treated at the authors’ institution (Duke University) in whom bariatric surgery was pursued successfully. The patients had previously undergone CSF shunting at ages 12, 15, and 23 years. They were shunt dependent for a collective average of 3.3 years prior to bariatriwc surgery. All patients reported “low-pressure” or postural headaches after bariatric surgery that correlated with dramatic reduction in their weight. Two of the 3 patients had their shunts removed and continued to be shunt free 1.5 years later at last follow-up; the third patient remained shunt dependent with the pressure set at 200 mm H2O. Given the significant complications inherent to multiple shunt revisions, earlier intervention for weight loss, including bariatric surgery, in these patients might have prevented complications and the associated health care burden. The authors recommend a multidisciplinary approach for IIH treatment with early consideration for weight loss interventions in select patients.

Background Medicine and surgery are turning toward simulation to improve on limited patient interaction during residency training. Many simulators today use virtual reality with augmented haptic feedback with little to no physical elements. In a collaborative effort, the University of Florida Department of Neurosurgery and the Center for Safety, Simulation & Advanced Learning Technologies created a novel "mixed" physical and virtual simulator to mimic the ventriculostomy procedure. The simulator contains all the physical components encountered for the procedure with superimposed 3-D virtual elements for the neuroanatomical structures. Objective To introduce the ventriculostomy simulator and its validation as a necessary training tool in neurosurgical residency. Methods We tested the simulator in more than 260 residents. An algorithm combining time and accuracy was used to grade performance. Voluntary postperformance surveys were used to evaluate the experience. Results Results demonstrate that more experienced residents have statistically significant better scores and completed the procedure in less time than inexperienced residents. Survey results revealed that most residents agreed that practice on the simulator would help with future ventriculostomies. Conclusion This mixed reality simulator provides a real-life experience, and will be an instrumental tool in training the next generation of neurosurgeons. We have now implemented a standard where incoming residents must prove efficiency and skill on the simulator before their first interaction with a patient.

Ogilvie's syndrome is a rare and potentially fatal disease that can easily be mistaken for postoperative ileus. Also known as acute colonic pseudo-obstruction, early recognition and diagnosis of the syndrome allows for treatment prior to bowel perforation and requisite abdominal surgery. The authors report a case of Ogilvie's syndrome following spinal deformity correction and tethered cord release in an adolescent who presented with acute abdominal distension, nausea, and vomiting on postoperative Day 0. The patient was initially diagnosed with adynamic ileus and treated conservatively with bowel rest, reduction in narcotic dosage, and a regimen of stool softeners, laxatives, and enemas. Despite this treatment, her clinical course failed to improve, and she demonstrated significant colonic distension radiographically. Intravenous neostigmine was administered as a bolus with a rapid and dramatic response. This case is the first reported instance of neostigmine use for Ogilvie's syndrome treatment following a pediatric neurosurgical operation.

Helmet use in two-wheeled vehicle accidents is widely reported to decrease the rates of death and traumatic brain injury. Previous reports suggest that there exists a trade off with helmet use consisting of an increased risk of cervical spine injuries. Recently, a review of a national trauma database demonstrated the opposite, with reduction in cervical spinal cord injuries in motorcycle crashes (MCC). In 2000, the State of Florida repealed its mandatory helmet law to make helmet use optional for individuals older than 21 with $10,000 of health insurance coverage. To better ascertain the risks of cervical spine injury with non-helmet use in all two-wheeled vehicles, we analyzed the University of Florida level one trauma center experience. We reviewed the Traumatic injury database over a five-year period (January 1, 2005, to July 1, 2010) for all patients involved in two-wheeled vehicle accidents. Patients were stratified according to vehicle type (motorcycle, scooter, and bicycle), helmet use, and the presence or absence of a cervical spine injury. Outcomes were compared for injury severity, cervical spine injury, cervical spinal cord injury, and presence of cervical spine injuries requiring surgery. Population means were compared using paired t-test. A total of 1331 patients were identified: 995 involved in motorcycle accidents, 87 involved in low-powered scooter accidents, and 249 involved in bicycle accidents. Helmet use was variable between each group. One hundred thirty-five total cervical spine injuries were identified. No evidence was found to suggest an increased risk of cervical spine injury or increased severity of cervical spine injury with helmet use. This fact, in combination with our previous findings, suggest that the law's age and insurance exemption should be revoked and a universal helmet law be reinstated in the state of Florida.

Background Surgical access to the third ventricle is challenging, given the depth of the operative field and close proximity of vital neural structures that must be traversed. For anterior third ventricular lesions, approach options include anterior transcallosal or transcortical, subfrontal, frontotemporal, or endonasal. The subcallosal approach, a translamina terminalis approach, is unique in that the surgical corridor is just below the corpus callosum, minimizes retraction and preserves corpus callosum integrity. Case examples are provided, and an anatomical study delineating the dimensions of the surgical corridor is performed. Methods Two latex-injected cadaver heads were used to describe the subcallosal corridor. A magnetic resonance imaging scan was obtained and registered with neuronavigation for correlative anatomical illustration. Depth, dimensions, and cross-sectional area were measured for the subcommunicating and supracommunicating corridors. Results The surgical depth for anterior transcallosal, subcallosal, and subfrontal approaches was 7.5 cm, 7.7 cm, and 7.6 cm respectively. The average corridor dimensions for the subcallosal approach were 14.75 × 6.63 mm compared with 8.88 × 5.38 mm for the subcommunicating corridor. Cross-sectional area of the subcommunicating corridor was 30.62 mm 2 compared with 80.42 mm 2 for supracommunicating. This was easily enlarged to 156.62 mm 2 with gentle retraction. Conclusions The anterior subcallosal approach is a safe approach for lesions of the third ventricle that avoids splitting the corpus callosum and resecting unnecessary brain and minimizes brain retraction. This corridor is superior to the traditional subfrontal approach in terms of working space and compares favorably to the anterior transcallosal approach without disrupting the corpus callosum.

Background In 2010, the Patient Protection and Affordable Care Act was passed to expand health insurance, narrow health care disparities, and improve health care quality in the United States. As part of this initiative, the Agency for Healthcare Research and Quality and the Centers for Medicare and Medicaid Services are now tracking quality metrics. Objective To analyze the effects of insurance on the incidence of patient safety indicators (PSIs) and hospital-acquired conditions (HACs) using the Nationwide Inpatient Sample for patients who have brain tumors. Methods The Nationwide Inpatient Sample was queried for all hospitalizations between 2002 and 2011 involving patients with brain tumors. Because of the confounding age restriction with Medicare, comparisons were made between Medicaid/self-pay and private insurance. To determine which factors contributed to HACs and PSIs, odds ratios were calculated for each risk factor. Logistic regression models were used to assess the effect of payer status on individual PSIs, HACs, and patient outcomes. Results Medicaid/self-pay patients had a higher PSI and HAC incidence compared with private insurance patients. The greater incidence of PSIs and HACs correlated with increased length of stay, worse discharge outcomes, and increased in-hospital mortality. Conclusion Variability exists in the incidence of PSIs and HACs in patients with brain tumors based on insurance status. Controlling for both patient and hospital factors can explain these differences. The cause of these disparities should be studied prospectively to begin the process of improving quality metrics in vulnerable patient populations.

This article reports on a retrospective review of the outcomes from 2-wheeled vehicle accidents and the impact of helmet use or non-use. The authors focus on the state of Florida, which rescinded its mandatory motorcycle helmet law in 2000. In the 10 years since this change, helmet use has dropped dramatically, and motorcycle fatalities have increased rapidly. In this study, the authors analyzed all 2-wheeled vehicle accidents evaluated at a level 1 trauma center over a 5-year period (2005-2010), comparing all outcomes, costs, and insurance status for helmeted and nonhelmeted riders (n = 1,439). Outcomes were compared for baseline population statistics, Glasgow Outcome Scale score, cost of hospitalization, discharge outcome, and health insurance status. In the 1,331 patients with full data, 995 (74.8%) were involved in motorcycle accidents, 249 (18.7%) were involved in bicycle accidents, and 87 (6.5%) were involved in scooter/moped accidents. Overall, 749 riders were nonhelmeted and 582 were helmeted. In the motorcycle group, there were 522 helmeted and 473 nonhelmeted riders. For the population of bicycle riders, there were 204 male and 45 female riders. For all vehicle types, hospital charges were skewed to the right, with a few expensive stays raising the overall average. For motorcycle riders, the average and median charges were significantly higher in nonhelmeted patients. For bicycle and scooter patients, no statistical significance was found; however, overall maximum charges were greatest in the nonhelmeted patients. In regard to insurance status, overall, riders wearing helmets were significantly more likely to have insurance than nonhelmeted riders. The authors conclude that, for the largest population (motorcycle riders), the results clearly demonstrate that helmets are effective in decreasing mortalities and improving outcomes at discharge. Also, as expected from the mortality and outcomes data, helmets significantly reduce the hospital charges for motorcycle riders involved in accidents. In estimating the cost savings for motorcycle helmet use, the authors found an average cost savings per helmeted patient of $23,603. The authors conclude that the age and insurance exemption of the law should be revoked and a universal helmet law be reinstated in the state of Florida. Motorcycle helmets significantly reduce overall morbidity and mortality, improve discharge outcome, and are cost-effective in healthcare savings.

Background Gangliogliomas are rare low grade, typically well-differentiated, tumors that are composed of mature ganglion cells and neoplastic glial cells. These tumors can appear at virtually any location along the neuroaxis but classically occur in the temporal lobe of young patients. In a small number of cases, gangliogliomas have presented as masses in the brainstem or involving cranial nerves. With the exception of vestibular schwannomas, bilateral tumors in the region of the internal auditory canal (IAC) or cerebellopontine angle (CPA) are exceedingly rare. Case description We report a case of a 58-year-old male who presented with hearing loss, tinnitus, and vertigo. Initial magnetic resonance imaging revealed bilateral nonenhancing IAC/CPA tumors. Based on this finding, a presumptive diagnosis of neurofibromatosis Type II was made, which was initially managed conservatively with close observation. He returned for follow-up with worsening vertigo and tinnitus, thus prompting the decision to proceed with surgical resection of the symptomatic mass. Intriguingly, pathological study demonstrated a WHO Grade I ganglioglioma. Description We report a case of a 58-year-old male who presented with hearing loss, tinnitus, and vertigo. Initial magnetic resonance imaging revealed bilateral nonenhancing IAC/CPA tumors. Based on this finding, a presumptive diagnosis of neurofibromatosis Type II was made, which was initially managed conservatively with close observation. He returned for follow-up with worsening vertigo and tinnitus, thus prompting the decision to proceed with surgical resection of the symptomatic mass. Intriguingly, pathological study demonstrated a WHO Grade I ganglioglioma. Conclusion This is the first reported case of bilateral IAC/CPA gangliogliomas. When evaluating bilateral IAC/CPA lesions with unusual imaging characteristics, ganglioglioma should be included in the differential diagnosis.

INTRODUCTION: The Patient Protection and Affordable Care Act was passed to narrow disparities and improve the quality of health care in the United States. The Agency for Healthcare Research and Quality patient safety indicators (PSIs) and the Centers for Medicare and Medicaid Services hospital-acquired conditions (HACs) are quality metrics tracked in healthcare institutions. The effects of insurance status on PSIs and HACs were analyzed using the Nationwide Inpatient Sample (NIS) database for brain tumor patients. METHODS: The NIS was queried for hospitalizations between 2002 and 2011 involving brain tumors patients. The incidence for each PSI and HAC was determined by ICD-9 codes. The independent variable was primary payer status. Because of the age restriction with Medicare, comparisons were made between Medicaid/self-pay and private insurance. Logistic regression modeling was used to estimate the effects of insurance status on individual PSIs, HACs, and patient outcomes. RESULTS: Overall, 113,797 PSIs and 15,810 HACs occurred in 548,727 brain tumor patients, an estimated national incidence of 20.7% and 2.9% respectively. Medicaid/self-pay patients had a higher PSI incidence compared to private insurance patients (20.6% versus 18.6%). Medicaid/self-pay patients also had a higher incidence of HACs (2.2% versus 1.9%). After controlling for patient and hospital factors, Medicaid/self-pay patients were estimated to experience 3.6% more PSIs per patient than private insurance (p = 0.0042). In addition, Medicaid/self-pay patients were eistamted to experience 12.6% more HACs per patient (p = 0.0001). The greater incidence of PSIs and HACs correlated with increased length of stay and worse discharge outcomes and in-hospital mortality in the Medicaid/self-pay patient population. CONCLUSIONS: Significant variability exists in the incidence of PSIs and HACs in brain tumor patients based on insurance status. The cause of these differences should be studied prospectively to begin the process of improving quality metrics in vulnerable patient populations.