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Ma K, Zhao D, Li X, Duan H, Yan C, Wang S, Zeng L, Xu K, Lai Y, Chen B, Mu N, Yang C, Quan Y, Li Z, Wang X, Feng H, Li F. Case report: Multiple brain metastases of atrial myxoma: Clinical experience and literature review. Front Neurol 2023; 13:1046441. [PMID: 36845225 PMCID: PMC9944787 DOI: 10.3389/fneur.2022.1046441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 12/22/2022] [Indexed: 02/11/2023] Open
Abstract
Myxoma is the most common type of benign cardiac tumor in adults, and it has a strong tendency to embolize or metastasize to distant organs. Patients with multiple brain metastases have rarely been seen in clinics; hence, standard treatment protocols for multimyxoma metastasis in the brain have not been established. We present the case of a 47-year-old female who had convulsions in the right hand and repeated seizures. Computed tomography revealed multiple tumor sites in her brain. Craniotomy was conducted to remove the tumor sites. However, recurrent brain tumors and unexpected cerebral infarctions occurred frequently shortly after the treatment because the cardiac myxoma had not been treated due to the patient's personal concerns. The myxoma was resected by gamma knife radiosurgery, and temozolomide was given prior to cardiac surgery. There has been no evidence of tumor recurrence from the 2 years following the surgery until the present. This case highlights the importance of prioritizing cardiac lesions over cerebral lesions; if a cerebral metastasis has been found, it is likely that the cardiac myxoma is already unstable, with high rates of spread and metastasis. Therefore, it is unwise to treat metastasis sites before the cardiac myxoma. Additionally, the case suggests that gamma knife radiosurgery combined with temozolomide is effective as treatment for multiple myxoma metastasis in the brain. Compared with conventional cerebral surgery, gamma knife radiosurgery is safer, causes less bleeding, and requires a shorter time for recovery.
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Affiliation(s)
- Kang Ma
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Dawei Zhao
- Department of Neurosurgery, Chongqing Sanbo Changan Hospital, Chongqing, China
| | - Xuegang Li
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Haijun Duan
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Chaojun Yan
- Department of Cardiosurgery, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Shi Wang
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Lan Zeng
- Department of Neurology, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
| | - Kai Xu
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Ying Lai
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Beike Chen
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Ning Mu
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Chuanyan Yang
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Yulian Quan
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Zhengyang Li
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Xiaoming Wang
- Department of Neurology, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
| | - Hua Feng
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Fei Li
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China,*Correspondence: Fei Li ✉
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Molina-Romero OI, Segura-Hernandez A, Fonnegra-Caballero A, Diez-Palma JC, Cortés-Muñoz F, Fonnegra-Pardo JR. Gamma Knife radiosurgery - 12 years of experience in a high-complexity center of a middle-income country. Surg Neurol Int 2022; 13:582. [PMID: 36600776 PMCID: PMC9805623 DOI: 10.25259/sni_679_2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 11/30/2022] [Indexed: 12/23/2022] Open
Abstract
Background Gamma Knife radiosurgery (GKR) is a technique that consists of the release of a high dose of ionizing radiation onto a therapeutic target, which has been previously delimited. This technique was described by Lars Leksell and Borje Larsson in 1951. In Colombia, there is only one GKR unit functioning machine nowadays. The objective of this study is to describe the institutional experience of a single institution with Gamma Knife Perfexion over 12 years. Methods We conducted a retrospective observational study. A total of 1906 medical records, taken from the period between May 4, 2010, and May 4, 2022, were included in the study. Descriptive analysis was performed through STATA 17 as statistic tool. Measures of central tendency were calculated depending on the distribution of the continuous data and proportions were taken into account in the case of qualitative variables. Results A total of 1906 procedures were performed. Patients from 1 year to 99 years old were treated, with a median age of 51 years. The most frequent diagnoses were meningioma (20.8%), arteriovenous malformation (AVM) (17%), vestibular schwannoma (15.6%), metastases (9.81%), and trigeminal neuralgia (9.12%). At 3-year posttreatment, in meningiomas, tumor size stability was observed in 57.3%, size decrease in 36%, and disappearance in 1.3%. In AVM, complete obliteration of the lesion was described in 36.8% and a decrease in size in 52.6%. Intracranial hemorrhage occurred in 5.2% during the follow-up period and 3.5% of all treated patients required a new procedure due to residual malformation. In vestibular schwannomas, tumor size remained stable in 62.2% and decreased in 28.8%. No new cases of facial paralysis after the procedure were described. At 1-year posttreatment, in metastasis, the size of the lesions remained stable in 40% of the patients, decreased in 47.5%, and disappeared in 2.5%. In trigeminal neuralgia, 88.4% of patients had pain relief and recurrences occurred in 16.6%. Acute complications were generally uncommon, the main ones being headache, pain at frame fixation points, and nausea. Conclusion Our experience suggests that GKR is a noninvasive procedure with a broad spectrum of clinical applications, low frequency of complications, feasible, with good enough control size of tumor and vascular lesions in images, and good clinical results in the medium and long term.
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Affiliation(s)
- Oscar I. Molina-Romero
- Department of Neurosurgery, Fundación Clínica Shaio, Bogotá, Colombia.,Corresponding author: Oscar I. Molina-Romero, Department of Neurosurgery, Fundación Clínica Shaio, Bogotá, Colombia.
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Theocharis S, Pappas EP, Seimenis I, Kouris P, Dellios D, Kollias G, Karaiskos P. Geometric distortion assessment in 3T MR images used for treatment planning in cranial Stereotactic Radiosurgery and Radiotherapy. PLoS One 2022; 17:e0268925. [PMID: 35605005 PMCID: PMC9126373 DOI: 10.1371/journal.pone.0268925] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 05/10/2022] [Indexed: 12/31/2022] Open
Abstract
Magnetic Resonance images (MRIs) are employed in brain Stereotactic Radiosurgery and Radiotherapy (SRS/SRT) for target and/or critical organ localization and delineation. However, MRIs are inherently distorted, which also impacts the accuracy of the Magnetic Resonance Imaging/Computed Tomography (MRI/CT) co-registration process. In this phantom-based study, geometric distortion is assessed in 3T T2-weighted images (T2WIs), while the efficacy of an MRI distortion correction technique is also evaluated. A homogeneous polymer gel-filled phantom was CT-imaged before being irradiated with 26 4-mm Gamma Knife shots at predefined locations (reference control points). The irradiated phantom was MRI-scanned at 3T, implementing a T2-weighted protocol suitable for SRS/SRT treatment planning. The centers of mass of all shots were identified in the 3D image space by implementing an iterative localization algorithm and served as the evaluated control points for MRI distortion detection. MRIs and CT images were spatially co-registered using a mutual information algorithm. The inverse transformation matrix was applied to the reference control points and compared with the corresponding MRI-identified ones to evaluate the overall spatial accuracy of the MRI/CT dataset. The mean image distortion correction technique was implemented, and resulting MRI-corrected control points were compared against the corresponding reference ones. For the scanning parameters used, increased MRI distortion (>1mm) was detected at areas distant from the MRI isocenter (>5cm), while median radial distortion was 0.76mm. Detected offsets were slightly higher for the MRI/CT dataset (0.92mm median distortion). The mean image distortion correction improves geometric accuracy, but residual distortion cannot be considered negligible (0.51mm median distortion). For all three datasets studied, a statistically significant positive correlation between detected spatial offsets and their distance from the MRI isocenter was revealed. This work contributes towards the wider adoption of 3T imaging in SRS/SRT treatment planning. The presented methodology can be employed in commissioning and quality assurance programmes of corresponding treatment workflows.
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Affiliation(s)
- Stefanos Theocharis
- Medical Physics Laboratory, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Eleftherios P. Pappas
- Medical Physics Laboratory, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Ioannis Seimenis
- Medical Physics Laboratory, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Panagiotis Kouris
- Medical Physics Laboratory, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Dimitrios Dellios
- Medical Physics Laboratory, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Georgios Kollias
- Medical Physics and Gamma Knife Department, Hygeia Hospital, Marousi, Greece
| | - Pantelis Karaiskos
- Medical Physics Laboratory, Medical School, National and Kapodistrian University of Athens, Athens, Greece
- * E-mail:
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Ramachandran P, Perrett B, Dancewicz O, Seshadri V, Jones C, Mehta A, Foote M. Use of GammaPlan convolution algorithm for dose calculation on CT and cone-beam CT images. Radiat Oncol J 2021; 39:129-138. [PMID: 34619830 PMCID: PMC8497862 DOI: 10.3857/roj.2020.00640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Accepted: 04/16/2021] [Indexed: 11/05/2022] Open
Abstract
Purpose The aim of this study was to assess the suitability of using cone-beam computed tomography images (CBCTs) produced in a Leksell Gamma Knife (LGK) Icon system to generate electron density information for the convolution algorithm in Leksell GammaPlan (LGP) Treatment Planning System (TPS). Materials and Methods A retrospective set of 30 LGK treatment plans generated for patients with multiple metastases was selected in this study. Both CBCTs and fan-beam CTs were used to provide electron density data for the convolution algorithm. Plan quality metrics such as coverage, selectivity, gradient index, and beam-on time were used to assess the changes introduced by convolution using CBCT (convCBCT) and planning CT (convCT) data compared to the homogeneous TMR10 algorithm. Results The mean beam-on time for TMR10 and convCBCT was found to be 18.9 ± 5.8 minutes and 21.7 ± 6.6 minutes, respectively. The absolute mean difference between TMR10 and convCBCT for coverage, selectivity, and gradient index were 0.001, 0.02, and 0.0002, respectively. The calculated beam-on times for convCBCT were higher than the time calculated for convCT treatment plans. This is attributed to the considerable variation in Hounsfield values (HU) dependent on the position within the field of view. Conclusion The artifacts from the CBCT’s limited field-of-view and considerable HU variation need to be taken into account before considering the use of convolution algorithm for dose calculation on CBCT image datasets, and electron data derived from the onboard CBCT should be used with caution.
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Affiliation(s)
| | - Ben Perrett
- Department of Radiation Oncology, Princess Alexandra Hospital, Brisbane, Australia
| | - Orrie Dancewicz
- Department of Radiation Oncology, Princess Alexandra Hospital, Brisbane, Australia
| | | | - Catherine Jones
- Department of Radiation Oncology, Princess Alexandra Hospital, Brisbane, Australia
| | - Akash Mehta
- Department of Radiation Oncology, Princess Alexandra Hospital, Brisbane, Australia
| | - Matthew Foote
- Department of Radiation Oncology, Princess Alexandra Hospital, Brisbane, Australia
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5
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Azar M, Mohsenian Sisakht A, Kazemi Gazik F, Shahrokhi P, Rastegar K, Karamzade-Ziarati N. PET-guided gamma knife radiosurgery in brain tumors: a brief review. Clin Transl Imaging 2021. [DOI: 10.1007/s40336-021-00447-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Bunevicius A, Sheehan D, Lee Vance M, Schlesinger D, Sheehan JP. Outcomes of Cushing's disease following Gamma Knife radiosurgery: effect of a center's growing experience and era of treatment. J Neurosurg 2021; 134:547-554. [PMID: 32005023 DOI: 10.3171/2019.12.jns192743] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 12/02/2019] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Stereotactic radiosurgery (SRS) is used for the management of residual or recurrent Cushing's disease (CD). Increasing experience and technological advancements of Gamma Knife radiosurgery (GKRS) systems can impact the outcomes of CD patients. The authors evaluated the association of their center's growing experience and the era in which GKRS was performed with treatment success and adverse events in patients with CD. METHODS The authors studied consecutive patients with CD treated with GKRS at the University of Virginia since installation of the first Gamma Knife system in March 1989 through August 2019. They compared endocrine remission and complication rates between patients treated before 2000 (early cohort) and those who were treated in 2000 and later (contemporary cohort). RESULTS One hundred thirty-four patients with CD underwent GKRS during the study period: 55 patients (41%) comprised the early cohort, and 79 patients (59%) comprised the contemporary cohort. The contemporary cohort, compared with the early cohort, had a significantly greater treatment volume, radiation prescription dose, maximal dose to the optic chiasm, and number of isocenters, and they more often had cavernous sinus involvement. Endocrine remission rates were higher in the contemporary cohort when compared with the early cohort (82% vs 66%, respectively; p = 0.01). In a Cox regression analysis adjusted for demographic, clinical, and SRS characteristics, the contemporary GKRS cohort had a higher probability of endocrine remission than the early cohort (HR 1.987, 95% CI 1.234-3.199; p = 0.005). The tumor control rate, incidence of cranial nerve neuropathy, and new anterior pituitary deficiency were similar between the two groups. CONCLUSIONS Technological advancements over the years and growing center experience were important factors for improved endocrine remission rates in patients with CD. Technological aspects and results of contemporary Gamma Knife systems should be considered when counseling patients, planning treatment, and reporting treatment results. Studies exploring the learning curve for GKRS are warranted.
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Affiliation(s)
| | | | - Mary Lee Vance
- Departments of1Neurological Surgery and
- 2Medicine, University of Virginia Health System, Charlottesville, Virginia
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7
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Yang I, Udawatta M, Prashant GN, Preet K, Mekonnen M, Duong C, Sheppard JP, Nguyen T, Bloch O, Jensen R, Sheehan J, Kalkanis S, Warnick RE. Commentary: Stereotactic Radiosurgery Training for Neurosurgery Residents: Results of a Survey of Residents, Attendings, and Program Directors by the American Association of Neurological Surgeons/Congress of Neurological Surgeons Section on Tumors. Neurosurgery 2018; 84:E86-E91. [PMID: 30407565 DOI: 10.1093/neuros/nyy514] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Accepted: 09/27/2018] [Indexed: 11/14/2022] Open
Affiliation(s)
- Isaac Yang
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California.,Department of Office of the Patient Experience, Ronald Reagan UCLA Medical Center, Los Angeles, California.,Department of Radiation Oncology, Ronald Reagan UCLA Medical Center, Los Angeles, California.,Department of Head and Neck Surgery, Ronald Reagan UCLA Medical Center, Los Angeles, California.,UCLA Jonsson Comprehensive Cancer Center, Ronald Reagan UCLA Medical Center, Los Angeles, California.,Department of Neurosurgery, Harbor-UCLA Medical Center, Torrance, California.,Los Angeles Biomedical Research Institute (LA BioMed), Harbor-UCLA Medical Center, Torrance, California
| | - Methma Udawatta
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California
| | - Giyarpuram N Prashant
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California
| | - Komal Preet
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California
| | - Mahlet Mekonnen
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California
| | - Courtney Duong
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California
| | - John P Sheppard
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California
| | - Thien Nguyen
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California
| | - Orin Bloch
- Department of Neurological Surgery, Northwestern University, Feinberg School of Medicine, Chicago, Illinois
| | - Randy Jensen
- Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City, Utah
| | - Jason Sheehan
- Department of Neurosurgery, University of Virginia, Charlottesville, Virginia
| | - Steven Kalkanis
- Department of Neurosurgery, Hermelin Brain Tumor Center, Henry Ford Health System, Detroit, Michigan
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8
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Yang I, Udawatta M, Prashant GN, Lagman C, Bloch O, Jensen R, Sheehan J, Kalkanis S, Warnick R. Stereotactic Radiosurgery for Neurosurgical Patients: A Historical Review and Current Perspectives. World Neurosurg 2018; 122:522-531. [PMID: 30399473 DOI: 10.1016/j.wneu.2018.10.193] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 10/24/2018] [Accepted: 10/26/2018] [Indexed: 12/09/2022]
Abstract
Today, stereotactic radiosurgery is an effective therapy for a variety of intracranial pathology that were treated solely with open neurosurgery in the past. The technique was developed from the combination of therapeutic radiation and stereotactic devices for the precise localization of intracranial targets. Although stereotactic radiosurgery was originally performed as a partnership between neurosurgeons and radiation oncologists, this partnership has weakened in recent years, with some procedures being performed without neurosurgeons. At the same time, neurosurgeons across the United States and Canada have found their stereotactic radiosurgery training during residency inadequate. Although neurosurgeons, residency directors, and department chairs agree that stereotactic radiosurgery education and exposure during neurosurgery training could be improved, a limited number of resources exist for this kind of education. This review describes the history of stereotactic radiosurgery, assesses the state of its use and education today, and provides recommendations for the improvement of neurosurgical education in stereotactic radiosurgery for the future.
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Affiliation(s)
- Isaac Yang
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA; Office of the Patient Experience, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA; Department of Radiation Oncology, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA; Department of Head and Neck Surgery, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA; UCLA Jonsson Comprehensive Cancer Center, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA; Department of Neurosurgery, Harbor-UCLA Medical Center, Torrance, California, USA; Los Angeles Biomedical Research Institute (LA BioMed) at Harbor-UCLA Medical Center, Torrance, California, USA.
| | - Methma Udawatta
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA
| | - Giyarpuram N Prashant
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA
| | - Carlito Lagman
- Department of Neurosurgery, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA
| | - Orin Bloch
- Department of Neurological Surgery, Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA
| | - Randy Jensen
- Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City, Utah, USA
| | - Jason Sheehan
- Department of Neurosurgery, University of Virginia, Charlottesville, Virginia, USA
| | - Steven Kalkanis
- Department of Neurosurgery, Hermelin Brain Tumor Center, Henry Ford Health System, Detroit, Michigan, USA
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Xu AY, Bhatnagar J, Bednarz G, Flickinger J, Arai Y, Vacsulka J, Feng W, Monaco E, Niranjan A, Lunsford LD, Huq MS. Failure modes and effects analysis (FMEA) for Gamma Knife radiosurgery. J Appl Clin Med Phys 2017; 18:152-168. [PMID: 29082599 PMCID: PMC5689925 DOI: 10.1002/acm2.12205] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 08/27/2017] [Accepted: 08/31/2017] [Indexed: 12/05/2022] Open
Abstract
PURPOSE Gamma Knife radiosurgery is a highly precise and accurate treatment technique for treating brain diseases with low risk of serious error that nevertheless could potentially be reduced. We applied the AAPM Task Group 100 recommended failure modes and effects analysis (FMEA) tool to develop a risk-based quality management program for Gamma Knife radiosurgery. METHODS A team consisting of medical physicists, radiation oncologists, neurosurgeons, radiation safety officers, nurses, operating room technologists, and schedulers at our institution and an external physicist expert on Gamma Knife was formed for the FMEA study. A process tree and a failure mode table were created for the Gamma Knife radiosurgery procedures using the Leksell Gamma Knife Perfexion and 4C units. Three scores for the probability of occurrence (O), the severity (S), and the probability of no detection for failure mode (D) were assigned to each failure mode by 8 professionals on a scale from 1 to 10. An overall risk priority number (RPN) for each failure mode was then calculated from the averaged O, S, and D scores. The coefficient of variation for each O, S, or D score was also calculated. The failure modes identified were prioritized in terms of both the RPN scores and the severity scores. RESULTS The established process tree for Gamma Knife radiosurgery consists of 10 subprocesses and 53 steps, including a subprocess for frame placement and 11 steps that are directly related to the frame-based nature of the Gamma Knife radiosurgery. Out of the 86 failure modes identified, 40 Gamma Knife specific failure modes were caused by the potential for inappropriate use of the radiosurgery head frame, the imaging fiducial boxes, the Gamma Knife helmets and plugs, the skull definition tools as well as other features of the GammaPlan treatment planning system. The other 46 failure modes are associated with the registration, imaging, image transfer, contouring processes that are common for all external beam radiation therapy techniques. The failure modes with the highest hazard scores are related to imperfect frame adaptor attachment, bad fiducial box assembly, unsecured plugs/inserts, overlooked target areas, and undetected machine mechanical failure during the morning QA process. CONCLUSIONS The implementation of the FMEA approach for Gamma Knife radiosurgery enabled deeper understanding of the overall process among all professionals involved in the care of the patient and helped identify potential weaknesses in the overall process. The results of the present study give us a basis for the development of a risk based quality management program for Gamma Knife radiosurgery.
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Affiliation(s)
- Andy Yuanguang Xu
- Department of Radiation OncologyUniversity of Pittsburgh Cancer InstitutePittsburghPAUSA
| | - Jagdish Bhatnagar
- Department of Radiation OncologyUniversity of Pittsburgh Cancer InstitutePittsburghPAUSA
| | - Greg Bednarz
- Department of Radiation OncologyUniversity of Pittsburgh Cancer InstitutePittsburghPAUSA
| | - John Flickinger
- Department of Radiation OncologyUniversity of Pittsburgh Cancer InstitutePittsburghPAUSA
| | - Yoshio Arai
- Department of Radiation OncologyUniversity of Pittsburgh Cancer InstitutePittsburghPAUSA
| | - Jonet Vacsulka
- Department of Neurological SurgeryUniversity of Pittsburgh Medical CenterPittsburghPAUSA
| | - Wenzheng Feng
- Department of Radiation OncologyNew York Presbyterian Hospital/Columbia University Medical CenterNew YorkNYUSA
| | - Edward Monaco
- Department of Neurological SurgeryUniversity of Pittsburgh Medical CenterPittsburghPAUSA
| | - Ajay Niranjan
- Department of Neurological SurgeryUniversity of Pittsburgh Medical CenterPittsburghPAUSA
| | - L. Dade Lunsford
- Department of Neurological SurgeryUniversity of Pittsburgh Medical CenterPittsburghPAUSA
| | - M. Saiful Huq
- Department of Radiation OncologyUniversity of Pittsburgh Cancer InstitutePittsburghPAUSA
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Kotecha R, Zimmerman A, Murphy ES, Ahmed Z, Ahluwalia MS, Suh JH, Reddy CA, Angelov L, Vogelbaum MA, Barnett GH, Chao ST. Management of Brain Metastasis in Patients With Pulmonary Neuroendocrine Carcinomas. Technol Cancer Res Treat 2016; 15:566-72. [DOI: 10.1177/1533034615589033] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 05/06/2015] [Indexed: 01/01/2023] Open
Abstract
Background: The patterns of intracranial failure in patients with brain metastasis from pulmonary neuroendocrine carcinoma (PNEC) remain unknown. Methods: From 1998 to 2013, 29 patients with the diagnosis of PNEC were treated for brain metastasis: 16 patients (55%) underwent whole-brain radiation therapy (WBRT), 5 (17%) patients underwent WBRT with a stereotactic radiosurgery (SRS) boost, and 8 (28%) patients underwent primary SRS alone. Results: The median age at treatment was 61 years (range: 44-84 years) and the median follow-up was 9.6 months (0-157.4 months). Of the patients treated with SRS alone, 1 patient had radiographic local progression of disease and 1 patient had a distant intracranial failure. Of the patients treated with WBRT with or without an SRS boost, 9 patients developed intracranial progression, including 1 local failure. No differences in rates of intracranial progression or local failure between the 2 groups ( P = .94 and P = .44, respectively) were observed. The actuarial rates of distant intracranial failure at 12 months were 32.9% (95% confidence interval [95% CI] 8.9%-56.8%) and 25% (95% CI 0.0%-67.4%) in patients undergoing primary WBRT or SRS, respectively ( P = .31). The median overall survival was 15.8 months in patients treated with WBRT and 20.4 months in patients treated with primary SRS ( P = .78). Conclusion: Patients with brain metastasis from PNECs can be effectively treated with either WBRT or SRS alone, with a pattern of failure more consistent with non-small cell lung cancer than small cell lung cancer. In this series, there was not a statistically significant increased risk of distant intracranial failure when patients were treated with primary SRS.
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Affiliation(s)
- Rupesh Kotecha
- Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Amy Zimmerman
- Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Erin S. Murphy
- Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH, USA
- Rose Ella Burkhardt Brain Tumor and Neuro-Oncology Center, Cleveland Clinic, Cleveland, OH, USA
| | - Zain Ahmed
- Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Manmeet S. Ahluwalia
- Rose Ella Burkhardt Brain Tumor and Neuro-Oncology Center, Cleveland Clinic, Cleveland, OH, USA
- Department of Hematology and Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH, USA
| | - John H. Suh
- Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH, USA
- Rose Ella Burkhardt Brain Tumor and Neuro-Oncology Center, Cleveland Clinic, Cleveland, OH, USA
| | - Chandana A. Reddy
- Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Lilyana Angelov
- Rose Ella Burkhardt Brain Tumor and Neuro-Oncology Center, Cleveland Clinic, Cleveland, OH, USA
- Department of Neurosurgery, Cleveland Clinic, Cleveland, OH, USA
| | - Michael A. Vogelbaum
- Rose Ella Burkhardt Brain Tumor and Neuro-Oncology Center, Cleveland Clinic, Cleveland, OH, USA
- Department of Neurosurgery, Cleveland Clinic, Cleveland, OH, USA
| | - Gene H. Barnett
- Rose Ella Burkhardt Brain Tumor and Neuro-Oncology Center, Cleveland Clinic, Cleveland, OH, USA
- Department of Neurosurgery, Cleveland Clinic, Cleveland, OH, USA
| | - Samuel T. Chao
- Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH, USA
- Rose Ella Burkhardt Brain Tumor and Neuro-Oncology Center, Cleveland Clinic, Cleveland, OH, USA
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Kotecha R, Angelov L, Barnett GH, Reddy CA, Suh JH, Murphy ES, Neyman G, Chao ST. Calvarial and skull base metastases: expanding the clinical utility of Gamma Knife surgery. J Neurosurg 2015; 121 Suppl:91-101. [PMID: 25434942 DOI: 10.3171/2014.7.gks141272] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT Traditionally, the treatment of choice for patients with metastases to the calvaria or skull base has been conventional radiation therapy. Because patients with systemic malignancies are also at risk for intracranial metastases, the utility of Gamma Knife surgery (GKS) for these patients has been explored to reduce excess radiation exposure to the perilesional brain parenchyma. The purpose of this study was to report the efficacy of GKS for the treatment of calvarial metastases and skull base lesions. METHODS The authors performed a retrospective chart review of 21 patients with at least 1 calvarial or skull base metastatic lesion treated with GKS during 2001-2013. For 7 calvarial lesions, a novel technique, in which a bolus was placed over the treatment site, was used. For determination of local control or disease progression, radiation therapy data were examined and posttreatment MR images and oncology records were reviewed. Survival times from the date of procedure were estimated by using Kaplan-Meier analyses. RESULTS The median patient age at treatment was 57 years (range 29-84 years). A total of 19 (90%) patients received treatment for single lesions, 1 patient received treatment for 3 lesions, and 1 patient received treatment for 4 lesions. The most common primary tumor was breast cancer (24% of patients). Per lesion, the median clinical and radiographic follow-up times were 10.3 months (range 0-71.9 months) and 7.1 months (range 0-61.3 months), respectively. Of the 26 lesions analyzed, 14 (54%) were located in calvarial bones and 12 (46%) were located in the skull base. The median lesion volume was 5.3 cm(3) (range 0.3-55.6 cm(3)), and the median prescription margin dose was 15 Gy (range 13-24 Gy). The median overall survival time for all patients was 35.9 months, and the 1-year local control rate was 88.9% (95% CI 74.4%-100%). Local control rates did not differ between lesions treated with the bolus technique and those treated with traditional methods or between calvarial lesions and skull base lesions (p > 0.05). Of the 3 patients for whom local treatment failed, 1 patient received no further treatment and 2 patients responded to salvage chemotherapy. Subsequent brain parenchymal metastases developed in 2 patients, who then underwent GKS. CONCLUSIONS GKS is an effective treatment modality for patients with metastases to the calvarial bones or skull base. For patients with superficial calvarial lesions, a novel approach with bolus application resulted in excellent rates of local control. GKS provides an effective therapeutic alternative to conventional radiation therapy and should be considered for patients at risk for calvarial metastases and brain parenchymal metastases.
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12
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Variability in target delineation for cavernous sinus meningioma and anaplastic astrocytoma in stereotactic radiosurgery with Leksell Gamma Knife Perfexion. Acta Neurochir (Wien) 2014; 156:2303-12; discussion 2312-3. [PMID: 25246145 DOI: 10.1007/s00701-014-2235-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 09/05/2014] [Indexed: 10/24/2022]
Abstract
BACKGROUND Radiosurgery clinical practice relays on empirical observations and the experience of the practitioners involved in determining and delineating the target and therefore variability in target delineation might be expected for all the radiosurgery approaches, independent of the technique and the equipment used for delivering the treatment. The main aim of this study was to quantify the variability of target delineation for two radiosurgery targets expected to be difficult to delineate. The secondary aim was to investigate the dosimetric implications with respect to the plan conformity. The primary aim of the study has therefore a very general character, not being bound to one specific radiosurgery technique. MATERIALS AND METHODS Twenty radiosurgery centers were asked to delineate one cavernous sinus meningioma and one astrocytoma and to plan the treatments for Leksell Gamma Knife Perfexion. The analysis of the delineated targets was based on the calculated 50 % agreement volume, AV50. The AV50 was compared to each delineated target by the concordance index and discordance index. The differences in location, size, and shape of the delineated targets were also analyzed using the encompassing volume compared to the common volume, i.e., the AV100, of all delineated structures. RESULTS Target delineation led to major differences between the participating centers and therefore the AV50 was small in comparison to each delineated target volume. For meningioma, the AV50 was 5.90 cm(3), the AV100 was 2.60 cm(3), and the encompassing volume was 13.14 cm(3). For astrocytoma, the AV50 was 2.06 cm(3) while the AV100 was extremely small, only 0.05 cm(3), and the encompassing volume was 43.27 cm(3). These variations translate into corresponding discrepancies in plan conformity. CONCLUSIONS Significant differences in shape, size, and location between the targets included in this study were identified and therefore the clinical implications of these differences should be further investigated.
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Kılıç K, Avsar T, Akgün E, Özkan A, Toktaş ZO, Şeker A, Kılıç T. Gamma knife radiosurgery inhibits angiogenesis of meningiomas: in vivo rat corneal assay. World Neurosurg 2013; 80:598-604. [PMID: 23851230 DOI: 10.1016/j.wneu.2013.06.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Revised: 05/29/2013] [Accepted: 06/14/2013] [Indexed: 10/26/2022]
Abstract
OBJECTIVE The aim of this study is to reveal inhibitory effect of gamma knife irradiation on angiogenesis of meningiomas using rat corneal angiogenesis assay. METHODS A total of 72 rats were divided into three preliminary groups. Each group, consisting of 24 rats, was implanted to World Health Organization (WHO) grade I (typical), grade II (atypical), and grade III (malignant) meningioma. Each of these three preliminary groups of 24 rats, were then divided into four subgroups, each consisting of 6 rats and subsequently irradiated by gamma knife with dose prescriptions of 0, 14, 18, and 22 Gy. The numbers of vessels that developed around the micropockets of the corneas were counted and photographed on days 5, 10, 15, and 20. RESULTS For WHO grade I meningiomas, 18 and 22 Gy doses (P < 0.001), and for grade II meningiomas, the 22-Gy (P = 0.021) dose were found to inhibit tumor-induced angiogenesis compared with the radiation-free control group. For grade III meningiomas, there was no statistical difference with the control group in any of the doses applied. Our findings demonstrate that gamma knife irradiation may suppress the angiogenic activity of WHO grades I and II meningiomas but not of the grade III meningiomas. CONCLUSIONS For the first time, this study provides an experimental data to show the antiangiogenic effect of gamma knife irradiation on meningiomas.
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Affiliation(s)
- Kaya Kılıç
- Istanbul Training and Research Hospital, Department of Neurosurgery, Samatya, Turkey
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