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Hazany S, DeClouette B, Lowe J, Hwang DH, Kim PE, Bluml S, Partikian A. Corrigendum to: Glutathione Increase and Seizure Burden Decrease in Patients with Intractable Epilepsy on Ketogenic Diet. J Epilepsy Res 2023; 13:63-64. [PMID: 38223362 PMCID: PMC10783963 DOI: 10.14581/jer.23001.e1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2024] Open
Abstract
[This corrects the article DOI: 10.14581/jer.23001.].
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Affiliation(s)
- Saman Hazany
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Brittany DeClouette
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Jessica Lowe
- Department of Pediatrics & Neurology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Darryl H Hwang
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Paul E Kim
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Stefan Bluml
- Department of Radiology, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Arthur Partikian
- Department of Pediatrics & Neurology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
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Shiroishi MS, Weinert D, Cen SY, Varghese B, Dondlinger T, Prah M, Mendoza J, Nazemi S, Ameli N, Amini N, Shohas S, Chen S, Bigjahan B, Zada G, Chen T, Neman-Ebrahim J, Chang EL, Chow FE, Fan Z, Yang W, Attenello FJ, Ye J, Kim PE, Patel VN, Lerner A, Acharya J, Hu LS, Quarles CC, Boxerman JL, Wu O, Schmainda KM. A cross-sectional study to test equivalence of low- versus intermediate-flip angle dynamic susceptibility contrast MRI measures of relative cerebral blood volume in patients with high-grade gliomas at 1.5 Tesla field strength. Front Oncol 2023; 13:1156843. [PMID: 37799462 PMCID: PMC10548232 DOI: 10.3389/fonc.2023.1156843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 08/21/2023] [Indexed: 10/07/2023] Open
Abstract
Introduction 1.5 Tesla (1.5T) remain a significant field strength for brain imaging worldwide. Recent computer simulations and clinical studies at 3T MRI have suggested that dynamic susceptibility contrast (DSC) MRI using a 30° flip angle ("low-FA") with model-based leakage correction and no gadolinium-based contrast agent (GBCA) preload provides equivalent relative cerebral blood volume (rCBV) measurements to the reference-standard acquisition using a single-dose GBCA preload with a 60° flip angle ("intermediate-FA") and model-based leakage correction. However, it remains unclear whether this holds true at 1.5T. The purpose of this study was to test this at 1.5T in human high-grade glioma (HGG) patients. Methods This was a single-institution cross-sectional study of patients who had undergone 1.5T MRI for HGG. DSC-MRI consisted of gradient-echo echo-planar imaging (GRE-EPI) with a low-FA without preload (30°/P-); this then subsequently served as a preload for the standard intermediate-FA acquisition (60°/P+). Both normalized (nrCBV) and standardized relative cerebral blood volumes (srCBV) were calculated using model-based leakage correction (C+) with IBNeuro™ software. Whole-enhancing lesion mean and median nrCBV and srCBV from the low- and intermediate-FA methods were compared using the Pearson's, Spearman's and intraclass correlation coefficients (ICC). Results Twenty-three HGG patients composing a total of 31 scans were analyzed. The Pearson and Spearman correlations and ICCs between the 30°/P-/C+ and 60°/P+/C+ acquisitions demonstrated high correlations for both mean and median nrCBV and srCBV. Conclusion Our study provides preliminary evidence that for HGG patients at 1.5T MRI, a low FA, no preload DSC-MRI acquisition can be an appealing alternative to the reference standard higher FA acquisition that utilizes a preload.
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Affiliation(s)
- Mark S. Shiroishi
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
- Imaging Genetics Center, USC Mark and Mary Stevens Neuroimaging and Informatics Institute, Marina del Rey, CA, United States
- Department of Population and Public Health Sciences, Keck School of Medicine of USC, Los Angeles, CA, United States
| | - Dane Weinert
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Steven Y. Cen
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Bino Varghese
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | | | - Melissa Prah
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Jesse Mendoza
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Sina Nazemi
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Nima Ameli
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Negin Amini
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Salman Shohas
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Shannon Chen
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Bavrina Bigjahan
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Gabriel Zada
- Department of Neurological Surgery, Keck School of Medicine of USC, Los Angeles, CA, United States
| | - Thomas Chen
- Department of Neurological Surgery, Keck School of Medicine of USC, Los Angeles, CA, United States
| | - Josh Neman-Ebrahim
- Department of Neurological Surgery, Keck School of Medicine of USC, Los Angeles, CA, United States
| | - Eric L. Chang
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, United States
| | - Frances E. Chow
- Department of Neurological Surgery, Keck School of Medicine of USC, Los Angeles, CA, United States
| | - Zhaoyang Fan
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, United States
| | - Wensha Yang
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, United States
| | - Frank J. Attenello
- Department of Neurological Surgery, Keck School of Medicine of USC, Los Angeles, CA, United States
| | - Jason Ye
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, United States
| | - Paul E. Kim
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Vishal N. Patel
- Department of Radiology, Mayo Clinic, Jacksonville, FL, United States
| | - Alexander Lerner
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Jay Acharya
- Department of Radiology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, United States
| | - Leland S. Hu
- Department of Radiology, Mayo Clinic, Phoenix, AZ, United States
| | - C. Chad Quarles
- Cancer Systems Imaging, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Jerrold L. Boxerman
- Department of Diagnostic Imaging, The Warren Alpert Medical School of Brown University, Providence, RI, United States
| | - Ona Wu
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Kathleen M. Schmainda
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI, United States
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Hazany S, DeClouette B, Lowe J, Hwang DH, Kim PE, Bluml S, Partikian A. Brain Glutathione Increase and Seizure Burden Decrease in Patients with Intractable Epilepsy on Ketogenic Diet. J Epilepsy Res 2023; 13:1-6. [PMID: 37720681 PMCID: PMC10501816 DOI: 10.14581/jer.23001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 03/20/2023] [Accepted: 03/27/2023] [Indexed: 09/19/2023] Open
Abstract
Background and Purpose Ketogenic diet (KD) improves seizure control in patients with drug-resistant epilepsy. As increased mitochondrial levels of glutathione (GSH) might contribute to a change in seizure susceptibility, we quantified changes of absolute GSH levels in the brain by in vivo 1H magnetic resonance spectroscopy (1H MRS) and correlate that with degree of seizure control in patients on KD. Methods Five cognitively normal adult patients with drug-resistant epilepsy were initially included and 2 completed the study. Each patient was evaluated by a neurologist and registered dietitian at baseline, 1, 3, and 6 months for seizure status and diet adherence after initiation of a modified atkins diet. Multiple metabolites including GSH were quantified using LCModel (version 6.3-1P; Stephen Provencher, Oakville, ON, CA) on a short echo time single-voxel 1H MRS in parieto/occipital grey matter and parietal white matter on a 3 Tesla General Electric magnet prior to starting the ketogenic diet and at 6 months. Results Both patients (42-years-old male and 35-years-old female) demonstrated marked increases in absolute GSH level in both gray matter (0.12 to 1.40 and 0.10 to 0.70 international unit [IU]) and white matter (0.65 to 1.50 and 0.80 to 2.00 IU), as well as 50% improvements in seizure duration and frequency. Other metabolites including ketone bodies did not demonstrate consistent changes. Conclusions Markedly increased levels of GSH (7-fold and 14-fold) were observed in longitudinal prospective study of two adult patients with intractable epilepsy with 50% seizure improvement after initiation of ketogenic diets. This pilot study supports the possible anticonvulsant role of GSH in the brain.
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Affiliation(s)
- Saman Hazany
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Brittany DeClouette
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Jessica Lowe
- Department of Pediatrics & Neurology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Darryl H Hwang
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Paul E Kim
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Stefan Bluml
- Department of Radiology, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Arthur Partikian
- Department of Pediatrics & Neurology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
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Anderson RC, Patel V, Sheikh-Bahaei N, Liu CSJ, Rajamohan AG, Shiroishi MS, Kim PE, Go JL, Lerner A, Acharya J. Posterior Reversible Encephalopathy Syndrome (PRES): Pathophysiology and Neuro-Imaging. Front Neurol 2020; 11:463. [PMID: 32612567 PMCID: PMC7308488 DOI: 10.3389/fneur.2020.00463] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 04/29/2020] [Indexed: 12/18/2022] Open
Abstract
Posterior reversible encephalopathy syndrome (PRES) represents a unique clinical entity with non-specific clinical symptoms and unique neuroradiological findings. This syndrome may present with a broad range of clinical symptoms from headache and visual disturbances to seizure and altered mentation. Typical imaging findings include posterior-circulation predominant vasogenic edema. Although there are many well-documented diseases associated with PRES, the exact pathophysiologic mechanism has yet to be fully elucidated. Generally accepted theories revolve around disruption of the blood-brain barrier secondary to elevated intracranial pressures or endothelial injury. In this article, we will review the clinical, typical, and atypical radiological features of PRES, as well as the most common theories behind the pathophysiology of PRES. Additionally, we will discuss some of the treatment strategies for PRES related to the underlying disease state.
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Affiliation(s)
- Redmond-Craig Anderson
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Vishal Patel
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Nasim Sheikh-Bahaei
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Chia Shang J Liu
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Anandh G Rajamohan
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Mark S Shiroishi
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Paul E Kim
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - John L Go
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Alexander Lerner
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Jay Acharya
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
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Li CH, Rajamohan AG, Acharya PT, Liu CSJ, Patel V, Go JL, Kim PE, Acharya J. Virtual Read-Out: Radiology Education for the 21st Century During the COVID-19 Pandemic. Acad Radiol 2020; 27:872-881. [PMID: 32386950 PMCID: PMC7252195 DOI: 10.1016/j.acra.2020.04.028] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 04/13/2020] [Accepted: 04/14/2020] [Indexed: 11/18/2022]
Abstract
Video-conference platforms (VCPs) have rapidly become utilized in the current COVID-19 pandemic to promote social distancing. Radiology trainee education, as regulated by the ACGME, necessitates active learning based on image review and VCPs can facilitate and support this. Patient protected health information and HIPAA requirements must be adhered to even with VCPs and many platforms have the appropriate security measures to comply. Tools within the VCP permit two-way interaction, screen control/sharing, and annotation features, which enable appropriate education even in a remote setting.
Technologic advances have resulted in the expansion of web-based conferencing and education. While historically video-conferencing has been used for didactic educational sessions, we present its novel use in virtual radiology read-outs in the face of the COVID-19 pandemic. Knowledge of key aspects of set-up, implementation, and possible pitfalls of video-conferencing technology in the application of virtual read-outs can help to improve the educational experience of radiology trainees and promote potential future distance learning and collaboration.
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Sheikh-Bahaei N, Acharya J, Rajamohan A, Kim PE. Advanced Imaging Techniques in Diagnosis of Posterior Reversible Encephalopathy Syndrome (PRES). Front Neurol 2020; 11:165. [PMID: 32218764 PMCID: PMC7078242 DOI: 10.3389/fneur.2020.00165] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 02/21/2020] [Indexed: 11/23/2022] Open
Abstract
Diagnosis of Posterior Reversible Encephalopathy Syndrome (PRES) in some circumstances can be challenging and structural imaging may not be sufficient to distinguish it from other differential diagnostic considerations. Advanced imaging techniques, such as MR spectroscopy or positron emission tomography (PET) can provide additional information to determine the diagnosis. Other techniques, such as susceptibility weighted imaging (SWI) improves detection of hemorrhage which has prognostic role. CT or MR Perfusion as well as Single-Photon Emission Computed Tomography (SPECT) are more useful to understand the underlying vasculopathic changes in PRES and may answer some of the unresolved controversies in pathophysiology of this complex disease. In this review we summarized the findings of previous studies using these advanced methods and their utilities in diagnosis or prognosis of PRES.
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Affiliation(s)
- Nasim Sheikh-Bahaei
- Division of Neuroradiology, Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Jay Acharya
- Division of Neuroradiology, Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Anandh Rajamohan
- Division of Neuroradiology, Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Paul E Kim
- Division of Neuroradiology, Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
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Diao K, Bian SX, Routman DM, Yu C, Kim PE, Wagle NA, Wong MK, Zada G, Chang EL. Combination ipilimumab and radiosurgery for brain metastases: tumor, edema, and adverse radiation effects. J Neurosurg 2019; 129:1397-1406. [PMID: 29303446 DOI: 10.3171/2017.7.jns171286] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 07/14/2017] [Indexed: 12/16/2022]
Abstract
OBJECTIVETumor and edema volume changes of brain metastases after stereotactic radiosurgery (SRS) and ipilimumab are not well described, and there is concern regarding the safety of combination treatment. The authors evaluated tumor, edema, and adverse radiation-induced changes after SRS with and without ipilimumab and identified associated risk factors.METHODSThis single-institution retrospective study included 72 patients with melanoma brain metastases treated consecutively with upfront SRS from 2006 to 2015. Concurrent ipilimumab was defined as ipilimumab treatment within 4 weeks of SRS. At baseline and during each follow-up, tumor and edema were measured in 3 orthogonal planes. The (length × width × height/2) formula was used to estimate tumor and edema volumes and was validated in the present study for estimation of edema volume. Tumor and edema volume changes from baseline were compared using the Kruskal-Wallis test. Local failure, lesion hemorrhage, and treatment-related imaging changes (TRICs) were analyzed with the Cox proportional hazards model.RESULTSOf 310 analyzed lesions, 91 were not treated with ipilimumab, 59 were treated with concurrent ipilimumab, and 160 were treated with nonconcurrent ipilimumab. Of 106 randomly selected lesions with measurable peritumoral edema, the mean edema volume by manual contouring was 7.45 cm3 and the mean volume by (length × width × height)/2 formula estimation was 7.79 cm3 with R2 = 0.99 and slope of 1.08 on line of best fit. At 6 months after SRS, the ipilimumab groups had greater tumor (p = 0.001) and edema (p = 0.005) volume reduction than the control group. The concurrent ipilimumab group had the highest rate of lesion response and lowest rate of lesion progression (p = 0.002). Within the concurrent ipilimumab group, SRS dose ≥ 20 Gy was associated with significantly greater median tumor volume reduction at 3 months (p = 0.01) and 6 months (p = 0.02). The concurrent ipilimumab group also had the highest rate of lesion hemorrhage (p = 0.01). Any ipilimumab was associated with higher incidence of symptomatic TRICs (p = 0.005). The overall incidence of pathologically confirmed radiation necrosis (RN) was 2%. In multivariate analysis, tumor and edema response at 3 months were the strongest predictors of local failure (HR 0.131 and HR 0.125) and lesion hemorrhage (HR 0.225 and HR 0.262). Tumor and edema response at 1.5 months were the strongest predictors of TRICs (HR 0.144 and HR 0.297).CONCLUSIONSThe addition of ipilimumab improved tumor and edema volume reduction but was associated with a higher incidence of lesion hemorrhage and symptomatic TRICs. There may be a radiation dose-response relationship between SRS and ipilimumab when administered concurrently. Early tumor and edema response were excellent predictors of subsequent local failure, lesion hemorrhage, and TRICs. The incidence of pathologically proven RN was low, supporting the relative safety of ipilimumab in radiosurgery treatment.
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Affiliation(s)
- Kevin Diao
- 1Harvard Medical School, Boston, Massachusetts; and.,Departments of2Radiation Oncology
| | | | | | - Cheng Yu
- Departments of2Radiation Oncology
| | | | | | | | - Gabriel Zada
- 6Neurological Surgery, Keck School of Medicine of USC, Los Angeles, California
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Ravina K, Rennert RC, Kim PE, Strickland BA, Chun A, Russin JJ. Orphaned Middle Cerebral Artery Side-to-Side In Situ Bypass as a Favorable Alternative Approach for Complex Middle Cerebral Artery Aneurysm Treatment: A Case Series. World Neurosurg 2019; 130:e971-e987. [DOI: 10.1016/j.wneu.2019.07.053] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 07/03/2019] [Accepted: 07/04/2019] [Indexed: 10/26/2022]
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Ravina K, Kim PE, Rennert RC, Wolfswinkel EM, Strickland BA, Carey JN, Russin JJ. Lessons Learned from the Initial Experience with Pedicled Temporoparietal Fascial Flap for Combined Revascularization In Moyamoya Angiopathy: A Case Series. World Neurosurg 2019; 132:e259-e273. [PMID: 31491577 DOI: 10.1016/j.wneu.2019.08.182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 08/18/2019] [Accepted: 08/22/2019] [Indexed: 10/26/2022]
Abstract
BACKGROUND The pedicled temporoparietal fascial flap (TPFF) with a direct superficial temporal (STA) artery to middle cerebral artery (MCA) bypass is a novel combined revascularization approach for moyamoya angiopathy (MMA). With this case series, we aim to report the initial experience with pedicled TPFF combined revascularization for MMA treatment. METHODS Data from 14 consecutive patients undergoing pedicled TPFF combined revascularization for MMA between May 2016 and December 2018 were retrospectively reviewed. Patients admitted with acute ischemia or a modified Rankin Scale (mRS) score >3 were considered high risk. RESULTS Mean ± standard deviation age on surgery was 41.9 ± 15.4 years. Three of 14 patients (21.4%) presented with an mRS score >3. Nine of 14 patients (64.3%) presented with ischemic stroke, 4 of whom (44.4%) had acute ischemia. Direct anastomosis patency was confirmed in all cases postoperatively. Mean hospitalization time was 13 ± 9.3 days and mean follow-up time was 14.1 ± 9.3 months. From admission to follow-up, neurologic status improved in 8 patients (57.1%) and stabilized in 6 patients (42.9%). Overall, 11/14 patients (78.6%) achieved good functional outcome (mRS score ≤2). All patients achieved some radiographic collateral development, with 5 (71.5%) graded as Matsushima A and B. Three patients developed new radiographic ischemia and 3 experienced wound complications, all in the high-risk group. CONCLUSIONS The TPFF combined approach is a viable strategy for revascularization in MMA. This technique may be suboptimal in patients presenting with acute ischemia and/or mRS score >3.
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Affiliation(s)
- Kristine Ravina
- Neurorestoration Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Paul E Kim
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Robert C Rennert
- Department of Neurosurgery, University of California at San Diego, San Diego, California, USA
| | - Erik M Wolfswinkel
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Ben A Strickland
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Joseph N Carey
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Jonathan J Russin
- Neurorestoration Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA; Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
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Tafreshi AR, Du R, Rutkowski MJ, Donoho DA, Shiroishi MS, Liu CSJ, Kim PE, Carmichael JD, Zada G. Differential Clinical Presentation, Intraoperative Management Strategies, and Surgical Outcomes After Endoscopic Endonasal Treatment of Cystic Sellar Masses. World Neurosurg 2019; 133:e241-e251. [PMID: 31505289 DOI: 10.1016/j.wneu.2019.08.234] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/28/2019] [Accepted: 08/29/2019] [Indexed: 11/28/2022]
Abstract
BACKGROUND Cystic sellar masses (CSMs) pose diagnostic and therapeutic challenges associated with subtotal cyst wall resection, cerebrospinal fluid (CSF) leak repair, and disease recurrence. Current magnetic resonance imaging (MRI) interpretation often cannot reliably differentiate CSMs, mandating adaptable intraoperative strategies. We reviewed our diagnostic and therapeutic experience after endoscopic endonasal approaches (EEAs) for CSMs. METHODS A retrospective record review of patients with CSM managed via EEA at the University of Southern California from 2011 to 2018 was conducted. Patient demographics, preoperative characteristics, surgical details, pathologic findings, and postoperative outcomes were assessed. RESULTS Analysis included 47 patients (mean age, 43.2 years); of these, 78.7% were women. Preoperative symptoms included headache (76.6%) and vision loss (42.6%). Histologically verified sellar pathology included 27 Rathke cleft cysts (RCCs) (57.4%), 17 cystic pituitary adenomas (CPAs) (36.2%), 2 arachnoid cysts (4.3%), and 1 xanthogranuloma (2.1%). Twelve patients (70.6%) with CPAs underwent complete resection and 5 (29.4%) underwent subtotal resection. All 27 patients with RCC and 2 patients with arachnoid cyst underwent complete fenestration and drainage. One xanthogranuloma was completely resected. There were 14 intraoperative (29.8%) and 4 postoperative CSF leaks (8.5%). Headaches, vision, and endocrinopathy improved in 69.2%, 80.0%, and 33.3% of patients with CPA and 73.9%, 71.4%, and 40.9% of patients with RCC, respectively. There were 2 RCC recurrences and 1 CPA recurrence over the follow-up period. CONCLUSIONS Surgeons must prepare for versatile management strategies of CSMs based on pretest probability associated with MRI and intraoperative findings. Outcomes after EEA for CSMs show low complication profiles and excellent rates of headache and visual improvement, albeit lower rates of endocrine normalization.
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Affiliation(s)
- Ali R Tafreshi
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
| | - Robin Du
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Martin J Rutkowski
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Daniel A Donoho
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Mark S Shiroishi
- Division of Neuroradiology, Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Chia-Shang J Liu
- Division of Neuroradiology, Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Paul E Kim
- Division of Neuroradiology, Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - John D Carmichael
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA; Division of Endocrinology, Department of Internal Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Gabriel Zada
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
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11
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12
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Diao K, Sun Y, Yoo SK, Yu C, Ye JC, Trakul N, Jennelle RL, Kim PE, Zada G, Gruen JP, Chang EL. Safety-net versus private hospital setting for brain metastasis patients treated with radiosurgery alone: Disparities in follow-up care and outcomes. Cancer 2017; 124:167-175. [PMID: 28902402 DOI: 10.1002/cncr.30984] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 07/13/2017] [Accepted: 08/14/2017] [Indexed: 01/02/2023]
Abstract
BACKGROUND Stereotactic radiosurgery (SRS) alone is an increasingly accepted treatment for brain metastases, but it requires adherence to frequently scheduled follow-up neuroimaging because of the risk of distant brain metastasis. The effect of disparities in access to follow-up care on outcomes after SRS alone is unknown. METHODS This retrospective study included 153 brain metastasis patients treated consecutively with SRS alone from 2010 through 2016 at an academic medical center and a safety-net hospital (SNH) located in Los Angeles, California. Outcomes included neurologic symptoms, hospitalization, steroid use and dependency, salvage SRS, salvage whole-brain radiotherapy, salvage neurosurgery, and overall survival. RESULTS Ninety-three of the 153 patients were private hospital (PH) patients, and 60 were SNH patients. The median follow-up time was 7.7 months. SNH patients received fewer follow-up neuroimaging studies (1.5 vs 3; P = .008). In a multivariate analysis, the SNH setting was a significant risk factor for salvage neurosurgery (hazard ratio [HR], 13.65; P < .001), neurologic symptoms (HR, 3.74; P = .002), and hospitalization due to brain metastases (HR, 6.25; P < .001). More clinical visits were protective against hospitalizations due to brain metastases (HR, 0.75; P = .002), whereas more neuroimaging studies were protective against death (HR, 0.65; P < .001). CONCLUSIONS SNH patients with brain metastases treated with SRS alone had fewer follow-up neuroimaging studies and were at higher risk for neurologic symptoms, hospitalization for brain metastases, and salvage neurosurgery in comparison with PH patients. Clinicians should consider the practice setting and patient access to follow-up care when they are deciding on the optimal strategy for the treatment of brain metastases. Cancer 2018;124:167-75. © 2017 American Cancer Society.
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Affiliation(s)
- Kevin Diao
- Harvard Medical School, Boston, Massachusetts.,Department of Radiation Oncology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Yanqing Sun
- Department of Mathematics and Statistics, University of North Carolina at Charlotte, Charlotte, North Carolina
| | - Stella K Yoo
- Department of Radiation Oncology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Cheng Yu
- Department of Radiation Oncology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Jason C Ye
- Department of Radiation Oncology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Nicholas Trakul
- Department of Radiation Oncology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Richard L Jennelle
- Department of Radiation Oncology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Paul E Kim
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Gabriel Zada
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - John P Gruen
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Eric L Chang
- Department of Radiation Oncology, Keck School of Medicine, University of Southern California, Los Angeles, California
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Bakhsheshian J, Kim PE, Attenello FJ. Intramedullary Cervical Spinal Cord Abscess. World Neurosurg 2017; 106:1049.e1-1049.e2. [PMID: 28688992 DOI: 10.1016/j.wneu.2017.06.121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Revised: 06/17/2017] [Accepted: 06/19/2017] [Indexed: 12/01/2022]
Abstract
Intramedullary spinal cord abscesses are rarely encountered in modern neurosurgical practice. Select patients are at high risk for developing an intramedullary spinal cord abscess, which can result in acute neurologic deficits. Patients with failed conservative management may benefit from early surgical intervention; however, the evidence is limited by level 3 studies. In this case presentation, the patient failed conservative management for a cervical intramedullary spinal cord abscess and developed acute neurologic deficits. The decision was made to perform an urgent cervical laminectomy and drainage to avoid any further decline that may have occurred with continued conservative management. Increased awareness of intramedullary spinal cord abscess is warranted for its clinical suspicion and emergent treatment in select circumstances.
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Affiliation(s)
- Joshua Bakhsheshian
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
| | - Paul E Kim
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Frank J Attenello
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
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Nayyar M, Mayo MC, Shiroishi M, Commins D, Liu CY, Go JL, Kim PE, Zee CS, Law M, Lerner A. Atypical central neurocytoma with metastatic craniospinal dissemination: a case report. Clin Imaging 2016; 40:1108-1111. [DOI: 10.1016/j.clinimag.2016.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 06/09/2016] [Indexed: 11/27/2022]
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15
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Shiroishi MS, Cen SY, Tamrazi B, D'Amore F, Lerner A, King KS, Kim PE, Law M, Hwang DH, Boyko OB, Liu CSJ. Predicting Meningioma Consistency on Preoperative Neuroimaging Studies. Neurosurg Clin N Am 2016; 27:145-54. [PMID: 27012379 DOI: 10.1016/j.nec.2015.11.007] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
This article provides an overview of the neuroimaging literature focused on preoperative prediction of meningioma consistency. A validated, noninvasive neuroimaging method to predict tumor consistency can provide valuable information regarding neurosurgical planning and patient counseling. Most of the neuroimaging literature indicates conventional MRI using T2-weighted imaging may be helpful to predict meningioma consistency; however, further rigorous validation is necessary. Much less is known about advanced MRI techniques, such as diffusion MRI, MR elastography (MRE), and MR spectroscopy. Of these methods, MRE and diffusion tensor imaging appear particularly promising.
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Affiliation(s)
- Mark S Shiroishi
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.
| | - Steven Y Cen
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Benita Tamrazi
- Pediatric Neuroradiology, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA 90027, USA
| | - Francesco D'Amore
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Alexander Lerner
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Kevin S King
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Paul E Kim
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Meng Law
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Darryl H Hwang
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Orest B Boyko
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Chia-Shang J Liu
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
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16
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Huhdanpaa H, Hwang DH, Gasparian GG, Booker MT, Cen Y, Lerner A, Boyko OB, Go JL, Kim PE, Rajamohan A, Law M, Shiroishi MS. Image coregistration: quantitative processing framework for the assessment of brain lesions. J Digit Imaging 2015; 27:369-79. [PMID: 24395597 DOI: 10.1007/s10278-013-9655-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The quantitative, multiparametric assessment of brain lesions requires coregistering different parameters derived from MRI sequences. This will be followed by analysis of the voxel values of the ROI within the sequences and calculated parametric maps, and deriving multiparametric models to classify imaging data. There is a need for an intuitive, automated quantitative processing framework that is generalized and adaptable to different clinical and research questions. As such flexible frameworks have not been previously described, we proceeded to construct a quantitative post-processing framework with commonly available software components. Matlab was chosen as the programming/integration environment, and SPM was chosen as the coregistration component. Matlab routines were created to extract and concatenate the coregistration transforms, take the coregistered MRI sequences as inputs to the process, allow specification of the ROI, and store the voxel values to the database for statistical analysis. The functionality of the framework was validated using brain tumor MRI cases. The implementation of this quantitative post-processing framework enables intuitive creation of multiple parameters for each voxel, facilitating near real-time in-depth voxel-wise analysis. Our initial empirical evaluation of the framework is an increased usage of analysis requiring post-processing and increased number of simultaneous research activities by clinicians and researchers with non-technical backgrounds. We show that common software components can be utilized to implement an intuitive real-time quantitative post-processing framework, resulting in improved scalability and increased adoption of post-processing needed to answer important diagnostic questions.
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Affiliation(s)
- Hannu Huhdanpaa
- Department of Radiology, University of Southern California, 1500 San Pablo Street, Second Floor Imaging, Los Angeles, CA, 90033, USA,
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Abel RJ, Ji L, Yu C, Lederman A, Chen T, Liu C, Zada G, Kim PE, Apuzzo M, Chang EL. Stereotactic radiosurgery to the resection cavity for brain metastases: prognostic factors and outcomes. J Radiosurg SBRT 2015; 3:179-186. [PMID: 29296400 PMCID: PMC5746332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 08/28/2014] [Indexed: 06/07/2023]
Abstract
BACKGROUND Adjuvant stereotactic radiosurgery (SRS) alone after surgical resection is increasingly being used to provide excellent local control while avoiding the side effects of whole brain radiation therapy (WBRT). We report our ten year experience using this treatment scheme. PURPOSE/OBJECTIVES To determine the rates and any correlates of local control, distant brain failure, and overall survival using SRS alone to the resection cavity. MATERIALS/METHODS We performed a retrospective analysis of 509 patients with brain metastasis who underwent Gamma Knife SRS at our institution between 2003 and 2013. Of this group 85 patients were identified that had resection of the metastasis and subsequent SRS to the cavity. Mean dose to the resection cavity was 17.3 Gy (range 14-20) to an average volume of 12cc (range 0.3-83cc). Multiple patient, tumor, and treatment specific factors were collected for analysis (see Table 1). Vital statistics were provided by our institution's tumor registry. The primary endpoint of our analyses was recurrence free survival (RFS); defined as the duration in time between the date of SRS and any local or distant brain tumor recurrence. RESULTS With a median follow up of 16.4 months, the overall local and distant brain failure at 12 months was 13% (95%CI 5%-21%) and 51% (95%CI 37%-64%) respectively. RPA was class 1 (5%), 2 (75%), and 3 (20%). The median overall survival (OS) was 20 months. The median RFS was 24 months with radiosensitive tumors: non small cell lung cancer (n=12), breast (n=16), gastrointestinal (n=7), small cell lung cancer (n=1), and other (n=9) compared to 5.6 months (p=0.006) in radioresistant tumors: melanoma (n=33), sarcoma (n=1), and renal cell carcinoma (n=6). Median OS for radioresistant and radiosensitive patients was 12 vs 25 months respectively (p=0.11). Additionally, there was a significant improved survival difference seen amongst those who had a gross total resection (GTR, n=46) compared to a sub total resection (n=39) with median OS of 27 vs 16 months (p=0.020) respectively. Radiographic changes suggestive of radiation necrosis were present in 6 patients, 2 of which were determined histiopathologicaly after surgical intervention. Due to the limited number of local recurrence events (n=10), there was insufficient power to analyze prognostic factors for local recurrence. CONCLUSIONS Our results compare favorably with multiple other institution experiences showing excellent local control with SRS to the resection cavity following resection. Radioresistant histologies were associated with a worse RFS. Patients undergoing GTR had a significantly longer OS than those with STR. At our institution we continue to offer patients SRS to the resection cavity for those with good performance status and limited brain metastases.
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Affiliation(s)
- Ryan J Abel
- Keck USC School of Medicine Department of Radiation Oncology,1441 Eastlake Avenue, Los Angeles, CA 90033, USA
| | - Lingyun Ji
- USC Department of Preventive Medicine, 1501 San Pablo Street, ZNI 101, Los Angeles CA 90033, USA
| | - Cheng Yu
- Keck USC School of Medicine Department of Radiation Oncology,1441 Eastlake Avenue, Los Angeles, CA 90033, USA
| | - Ariel Lederman
- Keck School of Medicine of University of Southern California, 1975 Zonal Ave, Los Angeles, CA 90033, USA
| | - Thomas Chen
- Keck USC School of Medicine Department of Neurosurgery, 1520 San Pablo St. Suite 3800, Los Angeles, CA 90033, USA
| | - Charles Liu
- Keck USC School of Medicine Department of Neurosurgery, 1520 San Pablo St. Suite 3800, Los Angeles, CA 90033, USA
| | - Gabriel Zada
- Keck USC School of Medicine Department of Neurosurgery, 1520 San Pablo St. Suite 3800, Los Angeles, CA 90033, USA
| | - Paul E Kim
- Keck USC School of Medicine Department of Radiology, 1500 San Pablo Street, Second Floor Imaging, Los Angeles, CA 90033, USA
| | - Michael Apuzzo
- Keck USC School of Medicine Department of Neurosurgery, 1520 San Pablo St. Suite 3800, Los Angeles, CA 90033, USA
| | - Eric L Chang
- Keck USC School of Medicine Department of Radiation Oncology,1441 Eastlake Avenue, Los Angeles, CA 90033, USA
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18
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Lerner A, Mogensen MA, Kim PE, Shiroishi MS, Hwang DH, Law M. Clinical Applications of Diffusion Tensor Imaging. World Neurosurg 2014; 82:96-109. [DOI: 10.1016/j.wneu.2013.07.083] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Revised: 07/04/2013] [Accepted: 07/26/2013] [Indexed: 10/26/2022]
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19
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Jones J, Lerner A, Kim PE, Law M, Hsieh PC. Diffusion tensor imaging in the assessment of ossification of the posterior longitudinal ligament: a report on preliminary results in 3 cases and review of the literature. Neurosurg Focus 2012; 30:E14. [PMID: 21361752 DOI: 10.3171/2011.1.focus10262] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Cervical spondylotic myelopathy due to ossification of the posterior longitudinal ligament (OPLL) is a common neurosurgical disease that carries high morbidity. OPLL and other degenerative processes cause narrowing of the central canal, with subsequent spinal cord injury. Repeated minor trauma and vascular aberrations have been purported to underlie cervical spondylotic myelopathy, although the exact pathophysiological mechanism is unclear. Regardless, detection of early axonal damage may allow more timely surgical intervention and prediction of functional outcome. Diffusion tensor (DT) imaging of the cervical spine is a novel technique with improved sensitivity compared with conventional anatomical MR imaging that is currently available on most clinical scanners. This review describes the theoretical basis, application, and analysis of DT imaging as it pertains to neurosurgery. Particular emphasis is placed on OPLL.
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Affiliation(s)
- Jesse Jones
- Department of Neurosurgery, University of Southern California, Los Angeles, CA, USA.
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20
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Shiroishi MS, Habibi M, Rajderkar D, Yurko C, Go JL, Lerner A, Mogensen MA, Kim PE, Boyko OB, Zee CS, Law M. Perfusion and permeability MR imaging of gliomas. Technol Cancer Res Treat 2011; 10:59-71. [PMID: 21214289 DOI: 10.7785/tcrt.2012.500180] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Conventional contrast-enhanced MR imaging is the current standard technique for the diagnosis and treatment evaluation of gliomas and other brain neoplasms. However, this method is quite limited in its ability to characterize the complex biology of gliomas and so there is a need to develop more quantitative imaging methods. Perfusion and permeability MR imaging are two such techniques that have shown promise in this regard. This review will highlight the underlying principles, applications, and pitfalls of these evolving advanced MRI methods.
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Affiliation(s)
- M S Shiroishi
- Division of Neuroradiology, Department of Radiology, Keck School of Medicine, University of Southern California, 1500 San Pablo St, Los Angeles, CA 90033, USA.
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21
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Winer JL, Kim PE, Law M, Liu CY, Apuzzo ML. Visualizing the Future: Enhancing Neuroimaging with Nanotechnology. World Neurosurg 2011; 75:626-37; discussion 618-9. [DOI: 10.1016/j.wneu.2011.02.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2010] [Accepted: 02/04/2011] [Indexed: 11/30/2022]
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22
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Taghva A, Khalessi AA, Kim PE, Liu CY, Apuzzo MLJ. From atom to brain: applications of molecular imaging to neurosurgery. World Neurosurg 2010; 73:477-85. [PMID: 20920931 DOI: 10.1016/j.wneu.2010.02.058] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2009] [Accepted: 02/20/2010] [Indexed: 02/06/2023]
Abstract
Molecular imaging is a field born out of the happy marriage of molecular biology and radiology. The first installment of this two-part series on molecular imaging demonstrated basic principles for practitioners in the field of the neurosciences. This installment seeks to provide some illustrative examples, insights, and specific applications to the neurosciences. The fields of functional neurosurgery including the treatment of neuropsychiatric disorders, novel treatments and imaging of tumors, neuroregenerative medicine, and nanotechnology in vascular disorders are covered. Finally, we give some parting thoughts on the future of molecular imaging, including advances in the imaging of neurodegenerative disorders.
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Affiliation(s)
- Alexander Taghva
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
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23
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Taghva A, Kim PE, Liu CY, Apuzzo MLJ. Molecular imaging, part 1: apertures into the landscape of genomic medicine. World Neurosurg 2010; 73:307-16. [PMID: 20849785 DOI: 10.1016/j.wneu.2010.01.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2009] [Indexed: 01/16/2023]
Abstract
Conventional imaging paradigms rely on the detection of anatomical changes in disease that are preceded by molecular genetic changes that go otherwise undetected. With the advent of molecular imaging, it will be possible to detect these changes prior to the manifestation of disease. Molecular imaging is the amalgamation of molecular biology and imaging technology that was spawned by parallel advances in the two fields. Fundamental to this technique is the ability to directly image biological processes that precede the anatomical changes detected by conventional imaging techniques. The two main strategies for imaging of biologic processes are direct and indirect imaging techniques. Direct techniques use molecules that have specific affinities for targets of interest that can be radiolabeled or otherwise detected on imaging. Indirect imaging uses reporter genes that are coexpressed with therapeutic proteins or other proteins of interest to image vector-transfected cells. Optical imaging and nanotechnology paradigms will also prove to be important additions to the imaging armamentarium. The first installment of this two-part series on molecular imaging seeks to demonstrate basic principles and illustrative examples for the uninitiated neophyte to this field.
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Affiliation(s)
- Alexander Taghva
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
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24
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Abstract
The history of the development of cerebral imaging is a complex combination of the forces of innovation at both the individual and industrial levels. Principal paradigms of neuroimaging shifted as a result of technological breakthroughs, beginning with the discovery of x-rays and continuing with the development of computerized imaging to the latest imaging paradigm, nuclear magnetic resonance imaging. We discuss these landmarks in neuroimaging in historical context, with emphasis on the particularly rapid development of imaging technology during the past 30 to 40 years, including the most recent emerging technologies.
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Affiliation(s)
- Paul E Kim
- Department of Radiology, Division of Neuroradiology, Keck School of Medicine, University of Southern California, 1200 North State Street, Room 3740, Los Angeles, California 90033, USA.
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25
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Hoh DJ, Larsen DW, Elder JB, Kim PE, Giannotta SL, Liu CY. Novel Use of an Endovascular Embolectomy Device for Retrograde Suction Decompression-Assisted Clip Ligation of a Large Paraclinoid Aneurysm: Technical Case Report. Oper Neurosurg (Hagerstown) 2008; 62:ONSE412-3; discussion ONSE413-4. [DOI: 10.1227/01.neu.0000326027.39467.88] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Abstract
Objective:
Several different methodologies for proximal occlusion and retrograde suction decompression of large paraclinoid aneurysms have been reported previously. In this article, we describe the novel use of an endovascular embolectomy device (F.A.S.T. funnel catheter; Genesis Medical Interventional, Inc., Redwood City, CA) for temporary internal carotid artery occlusion and suction decompression of an intracranial aneurysm to facilitate surgical clip ligation. The combination of atraumatic occlusion technology and large lumen size makes this technique safer and easier.
Clinical Presentation:
A 53-year-old woman with progressive headaches underwent computed tomographic angiography, which revealed an unruptured large left paraclinoid aneurysm. Cerebral angiography confirmed the diagnosis. The patient did not tolerate a balloon test occlusion for therapeutic Hunterian internal carotid occlusion. The patient was subsequently taken to the operating room for a craniotomy and clip ligation of the aneurysm.
Intervention:
A standard left pterional craniotomy was performed with opening of the sylvian fissure and exposure of the left paraclinoid aneurysm. Intraoperative angiography with introduction of a new endovascular embolectomy device was performed. The device was deployed to achieve temporary occlusion of the cervical internal carotid artery, and aspiration through the central lumen allowed for retrograde suction decompression of the aneurysm. Collapse of the aneurysm through this technique permitted visualization of the aneurysmal neck with successful clip ligation.
Conclusion:
A new endovascular embolectomy device can be used to safely perform suction decompression of large paraclinoid aneurysms to facilitate clip ligation.
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Affiliation(s)
- Daniel J. Hoh
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Donald W. Larsen
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - James B. Elder
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Paul E. Kim
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Steven L. Giannotta
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Charles Y. Liu
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
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Oh BC, Pagnini PG, Wang MY, Liu CY, Kim PE, Yu C, Apuzzo MLJ. Stereotactic radiosurgery: adjacent tissue injury and response after high-dose single fraction radiation: Part I--Histology, imaging, and molecular events. Neurosurgery 2007; 60:31-44; discussion 44-5. [PMID: 17228251 DOI: 10.1227/01.neu.0000249191.23162.d2] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Radiosurgery is now the preferred treatment modality for many intracranial disease processes. Although almost 50 years have passed since it was introduced as a tool to treat neurological disease, investigations into its effects on normal tissues of the central nervous system are still ongoing. The need for these continuing studies must be underscored. A fundamental understanding of the brain parenchymal response to radiosurgery would permit development of strategies that would enhance and potentiate the radiosurgical treatment effects on diseased tissue while mitigating injury to normal structures. To date, most studies on the response of the central nervous system to radiosurgery have been performed on brain tissue in the absence of pathological lesions, such as benign tumors or metastases. Although instructive, these investigations fail to emulate the majority of clinical scenarios that involve radiosurgical treatment of specific lesions surrounded by normal brain parenchyma. This article is the first in a two-part series that addresses the brain parenchyma's response to radiosurgery. This first article analyzes the histological, radiographic, and molecular data gathered regarding the brain parenchymal response to radiosurgery and aims to suggest future studies that could enhance our understanding of the topic. The second article in the series begins by discussing strategies for radiosurgical therapeutic enhancement. It concludes by focusing on strategies for mitigation and repair of radiation-induced brain injury.
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Affiliation(s)
- Bryan C Oh
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, USA
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27
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Abstract
Primary central nervous system lymphoma (PCNSL) is an aggressive neoplastic process that occurs in both immunocompetent and immunocompromised patients. Over the past 30 years there has been a steady increase in the number of cases in both patient populations. The imaging features for the disease and demographic characteristics within these patient populations vary, and in this article the authors describe the salient features of these two groups.
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Affiliation(s)
- John L Go
- Department of Radiology, Division of Neuroradiology, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, USA.
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28
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Abstract
One of the most pertinent applications of the principle primum non nocere (first do no harm) is in the optimization of neurosurgical procedures for patients with resectable lesions. The gold standard for identifying eloquent areas of the brain to be avoided in resections is direct cortical stimulation and somatosensory evoked potential monitoring, which is itself an invasive, cumbersome and difficult technique for mapping these areas. Functional magnetic resonance imaging shows great promise as a viable noninvasive alternative to invasive mapping as well as significant current clinical utility in cases in which it cannot yet fully supplant cortical stimulation methods. Ongoing work is directed toward overcoming technical limitations, improved mapping of complex functions such as language and memory, and mapping of white matter tracts.
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Affiliation(s)
- Paul E Kim
- Department of Neuroradiology, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, USA.
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29
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Abstract
The pituitary is part of a chain of enormous biologic amplification, which is regulated by a small amount of releasing factors in the portal blood from the hypothalamus. The pituitary is a master gland that regulates a number of hormones. A subtle abnormality in the pituitary can cause significant changes in body metabolism. Because the pituitary glands are small structures, high-resolution imaging techniques are required to satisfactorily evaluate the gland. It is imperative for the radiologist to be familiar with the anatomy, physiology, and pathology of the pituitary gland, which provides a solid foundation for accurate interpretation of the imaging studies of the pituitary gland.
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Affiliation(s)
- Chi S Zee
- Department of Imaging, University of Southern California University Hospital, 1500 San Pablo Street, Los Angeles, CA 90033, USA.
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Abstract
Though advances in MRI will undoubtedly increase its use, particularly in the subacute period, CT will likely continue its primary role in the management of these injuries in the foreseeable future. The spectrum of imaging features of cranial gunshot injuries is vast, because they encompass all of the findings encountered in closed head injury in addition to the wide variety of problems associated with penetration. Thus, only a brief summary of the many varied aspects of this complex problem is presented here as a review of the more salient issues.
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Affiliation(s)
- Paul E Kim
- Division of Neuroradiology, Department of Radiology, Keck School of Medicine, University of Southern California, 1200 North State Street, Room 3740, Los Angeles, CA 90033, USA.
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Abstract
The imaging of head trauma has been one of the fundamental cornerstones of neuroradiology. As the practice of neuroimaging has matured, great strides have been made in the diagnostic as well as prognostic armamentarium available to physicians. Given the vast diversity of trauma mechanisms and clinical pathways, new advanced imaging technologies have had a lasting impact on the detection, description, and depiction of head trauma. Furthermore, these new tools are allowing the imaging specialist to function not only as an interpreter of what is seen but as a 21st century radiographic oracle. We present a comprehensive review of the imaging findings of sequlae of traumatic brain injury and the growing correlation of new neuroimaging techniques and neurotraumatic outcomes.
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Affiliation(s)
- Chi-Shing Zee
- Department of Radiology, Keck School of Medicine, University of Southern California, 1500 San Pablo Street, Los Angeles, CA 90033, USA.
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32
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Abstract
The trigeminal nerve is the largest of the cranial nerves, serving as a major conduit for sensory information from the head and neck and primarily providing motor innervation to the muscles of mastication. An understanding of the pathologic processes that may involve this nerve requires a detailed knowledge of its origin within the brain stem as well as its course intracranially. This article describes the neuroanatomy of the nerve and divides it into its various segments to provide a differential diagnosis of common and some uncommon pathologic processes.
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Affiliation(s)
- J L Go
- Department of Radiology, University of Southern California, Keck School of Medicine, Los Angeles 90033, USA
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Go JL, Kim PE, Ahmadi J, Seagall HD, Zee CS. Fungal infections of the central nervous system. Neuroimaging Clin N Am 2000; 10:409-25. [PMID: 10775959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
The diagnosis and treatment of central nervous system fungal infections typically pose problems for the clinician. With an increased incidence of fungal infections in immunocompromised patients, neuroradiologic imaging has become essential in determining complications and outcomes. This article provides a summary of the more common organisms encountered in fungal infections of the central nervous system and the imaging features primarily seen with CT and MR imaging.
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Affiliation(s)
- J L Go
- Department of Radiology, University of Southern California, Keck School of Medicine, Los Angeles, 90033, USA
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Zee CS, Go JL, Kim PE, DiGiorgio CM. Imaging of neurocysticercosis. Neuroimaging Clin N Am 2000; 10:391-407. [PMID: 10775958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Neurocysticercosis produces a variety of neurologic syndromes resulting from the cysticerci infestation of the central nervous system by the larvae of Taenia solium. Because of increased immigration to the United States from endemic areas, the incidence of neurocysticercosis has increased, especially in California, Texas, Arizona, and other southwestern states. Neuroimaging studies play a significant role in the diagnosis and management of patients with neurocysticercosis.
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Affiliation(s)
- C S Zee
- Division of Neuroradiology, Department of Radiology, University of Southern California, Keck School of Medicine, Los Angeles, 90033, USA
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Kim PE, Musher DM, Glezen WP, Rodriguez-Barradas MC, Nahm WK, Wright CE. Association of invasive pneumococcal disease with season, atmospheric conditions, air pollution, and the isolation of respiratory viruses. Clin Infect Dis 1996; 22:100-6. [PMID: 8824973 DOI: 10.1093/clinids/22.1.100] [Citation(s) in RCA: 207] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
We examined the relation of invasive pneumococcal disease to season, atmospheric conditions, and the rate of respiratory virus isolation in a community-wide surveillance program in Houston. Among adults, the number of cases of pneumococcal bacteremia peaked in midwinter and declined strikingly in midsummer, indicating a high degree of inverse correlation with the ambient temperature. We detected significant correlations between the occurrence of pneumococcal disease and the isolation of respiratory syncytial virus (P < .001), influenza virus (P < .001), and all viruses except influenza virus (P < .001), as well as with air pollution, as measured by SO2 levels (P < .001). In contrast, the rate of invasive pneumococcal disease among infants and children was relatively more sustained from October through May, with a notable decrease in summer months; the incidence of pneumococcal disease was therefore less strongly correlated with cold weather and less closely associated with the isolation of respiratory syncitial virus or influenza virus. However, pneumococcal disease among infants and children was associated with isolation of these viruses after a 4-week lag period as well as with isolation of adenovirus and ragweed pollen counts. The finding, with regard to children, that correlations tended to be stronger for events that occurred 1 month previously than for those that occurred contemporaneously is consistent with the concept that viral or allergic events predispose to otitis media with effusion, which becomes suppurative and leads to pneumococcal bacteremia or meningitis. For adults, a more immediate predisposition to pneumococcal pneumonia and bacteremia because of viral infection or air pollution was suggested.
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Affiliation(s)
- P E Kim
- Medicine Service (Infectious Disease Section), Veterans Affairs Medical Center, Houston, Texas, USA
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Kim PE, Zee CS. The radiologic evaluation of craniocerebral missile injuries. Neurosurg Clin N Am 1995; 6:669-87. [PMID: 8527910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A brief overview of the imaging findings in craniocerebral missile injury is presented here. CT scanning has established itself as the primary imaging modality for the complex injuries seen in CMI as well as its acute and delayed complications. Plain x-ray, angiography, and magnetic resonance imaging have more limited but sometimes important roles in the management of these injuries. With regard to outcome prediction, imaging has also proved to be of some, albeit limited, usefulness, primarily as adjuncts to clinical criteria such as the GCS. Future research with CT as well as magnetic resonance imaging will likely expand the clinical role of these modalities, particularly in the realm of outcome analysis.
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Affiliation(s)
- P E Kim
- Department of Radiology, University of Southern California School of Medicine, Los Angeles, USA
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