Publications by authors named "Ganesh M Shankar"

Purpose: Chordomas present most frequently in the lumbosacral spine. Spinal chordomas and treatment sequelae significantly affect quality of life (QOL) due to proximity of major neurovascular structures and the aggressive management required. However, since there are no validated instruments for this population, we aimed to develop a novel QOL metric for spinal chordoma patients.

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Tumor inflammation-associated neurotoxicity (TIAN) was recently proposed as a unique complication of immunotherapy in brain tumor patients. Here, we report a first comprehensive characterization of TIAN in CNS lymphoma (CNSL) patients treated with CD19-directed chimeric antigen receptor T-cells (CD19-CAR). TIAN occurred in 10/56 (17.

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Background: Simulation-based training is increasingly integrated into surgical education as a method to enhance technical skills in a safe and reproducible environment. This dual-institution pilot study - conducted within the neurosurgery residency programs at Massachusetts General Hospital and Stanford University - evaluates the feasibility and impact of integrating a three-dimensional printed anterior cervical discectomy and fusion (ACDF) simulator (UpSurgeon S.r.

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Chronic repetitive forces on the spinal column promote the development of degenerative spinal disease. Yet the mechanisms linking such macroscale mechanical forces to tissue hypertrophy remain unknown. Here we show that fibrotic regions in human ligamentum flavum naturally exposed to high stress display elevated Rho-associated kinase (ROCK) signalling and an increased density of myofibroblasts expressing smooth muscle actin α.

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Vertebral artery injury (VAI) is a known complication of blunt cervical spine trauma with a potential risk of stroke. Factors including cervical bony injury, spinal cord injury, and overall trauma severity have been linked to an increased risk of VAI. Despite its prevalence, there is little consensus on various aspects of this pathology, including its initial screening, diagnostic approaches, and therapeutic strategies.

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Objective: Large language models (LLMs) have shown promising performance on medical licensing examinations, but their ability to excel in subspecialty domains and their robustness under adversarial conditions remain unclear. Herein, the authors present AtlasGPT, a subspecialty-focused LLM for neurosurgery, and evaluate its performance on a benchmark multiple-choice question bank and under adversarial testing, as well as its ability to generate high-quality explanations.

Methods: AtlasGPT was built by fine-tuning GPT-4 architecture and retrieval-augmented generation from neurosurgical knowledge sources.

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Background: Vertebral artery occlusion (VAO) is a known complication of blunt cervical injuries and can be associated with a risk of devastating strokes. VAO can spontaneously recanalize, particularly following cervical spine intervention. The aim of this study is to examine overall recanalization rates, recanalization in the context of cervical spine intervention, and the associations between VAO and stroke, spinal cord injury, and acute cervical deformity.

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Objective: Postoperative rehabilitation is crucial for neurosurgical patients' rehabilitation, but access in low- and middle-income countries (LMICs) is often limited. Telerehabilitation offers a cost-effective, accessible alternative by providing remote therapy through digital platforms. This study compared telerehabilitation with traditional methods in LMICs, focusing on cost-effectiveness, clinical outcomes, and patient satisfaction.

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Objective: Prematch research productivity is a heavily utilized metric in evaluating neurosurgery residency applicants. With the rise in research output by successfully matched candidates and the so-called publication arms race, there is a growing interest in understanding the quality and impact of the research conducted by medical students who secure neurosurgery residency positions. This study aimed to characterize the research output of medical students who matched into neurosurgery in 2023, identify predictors of research productivity, and explore the implications of research output on match outcomes.

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The development of novel therapeutics in the field of spinal neurosurgery faces a litany of translational challenges. Achieving precise drug targeting within the confined spaces associated with the spinal cord, canal and vertebra requires the development of next generation delivery systems and devices. These must be capable of overcoming inherent barriers related to drug diffusion, whilst concurrently ensuring optimal drug distribution and retention.

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Objective: Strong performance in neurosurgical sub-internships is a vital component of a successful residency application and requires adequate familiarity with clinical knowledge and technical skills that may not be covered in standard medical school curricula. Accordingly, a need exists for immersive and comprehensive sub-internship preparation programs that respect time and resource limitations, are optimized based on longitudinal student feedback, provide opportunities for mentorship, and foster enthusiasm for neurosurgery. Therefore, residents at a single institution designed and implemented a comprehensive curriculum for a 1-day sub-internship academy.

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Article Synopsis
  • The text discusses the need for a method to constantly monitor the integrity of spinal hardware, as current methods fail to detect issues until symptoms appear, which could lead to serious complications.* -
  • It introduces a new technology called BioMDA (bio-adhesive metal detector array), designed to provide real-time, non-invasive tracking of spinal implants without using radiation.* -
  • The BioMDA features advanced electromagnetic coupling for precise positioning of implants, achieving accuracy levels under 0.5 mm, potentially revolutionizing postoperative monitoring of spinal instrumentation.*
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  • Racial and socioeconomic disparities impact the utilization of spine surgery for degenerative lumbar spondylolisthesis in the U.S., potentially leading to poorer health outcomes for BIPOC patients.
  • A study involving 9,941 patients revealed that BIPOC individuals were significantly less likely to undergo surgery compared to White patients and had lower odds of achieving important improvements in physical function and pain management.
  • The findings highlight the need for addressing these disparities to improve health-related quality of life for affected populations.
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Delays and risks associated with neurosurgical biopsies preclude timely diagnosis and treatment of central nervous system (CNS) lymphoma and other CNS neoplasms. We prospectively integrated targeted rapid genotyping of cerebrospinal fluid (CSF) into the evaluation of 70 patients with CNS lesions of unknown cause. Participants underwent genotyping of CSF-derived DNA using a quantitative polymerase chain reaction-based approach for parallel detection of single-nucleotide variants in the MYD88, TERT promoter, IDH1, IDH2, BRAF, and H3F3A genes within 80 minutes of sample acquisition.

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Article Synopsis
  • Survival rates for glioblastoma IDH wild-type (GBM) vary, emphasizing the need for improved surgical strategies, particularly given that most recurrences occur close to the resection margin.
  • A predictive model was created to determine which GBMs could achieve radiographic gross-total resection (GTR), showing strong accuracy in forecasting surgical outcomes based on tumor characteristics.
  • Analysis of surgical margins using a rapid method revealed that patients with undetected TERT promoter mutations after GTR had significantly better survival rates compared to those with detectable mutations.
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Stroke-related cardiac death is a significant concern for patients with stroke and their healthcare providers. It is a complex and multifaceted condition that requires careful management of both modifiable and non-modifiable risk factors. This review provides an overview of the pathophysiology, risk factors, and prevention strategies for stroke-related cardiac death.

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Purpose: Primary central nervous system (CNS) gliomas can be classified by characteristic genetic alterations. In addition to solid tissue obtained via surgery or biopsy, cell-free DNA (cfDNA) from cerebrospinal fluid (CSF) is an alternative source of material for genomic analyses.

Experimental Design: We performed targeted next-generation sequencing of CSF cfDNA in a representative cohort of 85 patients presenting at two neurooncological centers with suspicion of primary or recurrent glioma.

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Article Synopsis
  • The study investigates the distribution of clinically actionable mutations in foramen magnum (FM) meningiomas, which are challenging to surgically treat and have high risks associated with them.
  • Targeted next-generation sequencing was performed on 62 FM meningiomas, excluding those related to radiation or neurofibromatosis type 2, and various patient and tumor characteristics were evaluated.
  • Results showed that 93.5% of tumors had significant driver mutations, with TRAF7 and AKT1E17K being the most common, and their mutations were linked to specific tumor locations relative to the brainstem.
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Article Synopsis
  • * Researchers used a technique called Wide-bandwidth AFM-based ViscoElastic Spectroscopy (WAVES) to analyze how viscoelastic properties evolve from single cancer cells to larger tumor structures.
  • * The study found that established tumors display increased stiffness and unique energy dissipation methods based on fluid-solid interactions, which are linked to cellular density and require a healthy actin cytoskeleton, revealing potential targets for cancer treatment.
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  • The study aims to investigate sarcopenic obesity (SO) as a prognostic factor in patients with spinal metastases undergoing surgery, as its impact may be underestimated in obese patients.
  • Researchers used a deep learning method to assess fat and lean tissue on preoperative CT scans of patients treated for spinal metastases from 2010 to 2020, comparing outcomes between those with SO and nonsarcopenic obesity.
  • Findings revealed that patients with SO faced higher risks of complications, increased likelihood of non-home discharge, readmission within 30 days, and greater mortality at both 90 days and 1 year post-surgery, highlighting the need for careful evaluation of body composition in obese surgical patients.
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  • The 2021 WHO classification of CNS tumors combines histopathology and molecular profiling to effectively differentiate between adult malignant brain tumors, particularly gliomas and primary CNS lymphomas (PCNSL).
  • A new intraoperative integrated diagnostic (i-ID) system has been developed that enhances traditional frozen-section diagnosis with a qPCR-based genotyping assay, crucial for therapeutic decision-making.
  • After testing the i-ID system on 101 patients, it showed high reliability, matching permanent diagnoses in nearly all cases, thus proving to be a valuable tool for accurate classification of adult malignant CNS tumors.
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Objective: Surgery for metastatic spinal tumors can have a substantial impact on patients' quality of life by alleviating pain, improving function, and correcting spinal instability when indicated. The decision to operate is difficult because many patients with cancer are frail. Studies have highlighted the importance of preoperative nutritional status assessments; however, little is known about which aspects of nutrition accurately inform clinical outcomes.

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Article Synopsis
  • CAR T-cell therapy targeting CD19 shows effectiveness and safety in treating patients with central nervous system (CNS) lymphoma, with a notable CNS response in 68.9% of cases.
  • The study examined 45 CAR T-cell transfusions, identifying mild to severe neurological toxicities, particularly increased risks associated with secondary CNS lymphomas and early fever.
  • Dexamethasone dosage during lymphodepletion was linked to higher CNS progression, while ibrutinib as bridging therapy suggested better outcomes in CNS-progression-free survival.
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Objective: Group patients who required open surgery for metastatic breast cancer to the spine by functional level and metastatic disease characteristics to identify factors that predispose to poor outcomes.

Methods: A retrospective analysis included patients managed at 2 tertiary referral centers from 2008 to 2020. The primary outcome was a 90-day adverse event.

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