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1.
J Neurosurg ; : 1-14, 2024 May 31.
Artículo en Inglés | MEDLINE | ID: mdl-38820606

RESUMEN

OBJECTIVE: The term "sagittal stratum" was coined by Heinrich Sachs in 1892 to define a parasagittally oriented white matter layer at the temporo-occipital cortex. Although this term has been widely used for more than 100 years, the description, classification, borders, and involved fibers of the structure vary among authors and remain imprecise. Through fiber microdissection and tractography, the authors aimed to define the sagittal stratum and resolve the uncertainty by revealing the relationship of this structure to other cerebral white matter pathways and the orientation of fibers in it. METHODS: Twenty postmortem human cerebral hemispheres were prepared according to Klingler's method. Fiber dissections were performed under a surgical microscope and with microsurgical techniques. The results of dissection at each step were photographed with 2D and 3D imaging techniques, and 3D photogrammetry techniques were used to create a 360° model. Diffusion tensor imaging and 7T high-resolution MRI were used to confirm the findings. RESULTS: This study revisited the 3D organization of white matter tracts in the sagittal stratum through fiber microdissection and tractography. The microneuroanatomical structure of the sagittal stratum and its special organization with fibers from all three fiber systems are demonstrated. The authors' findings revealed that the sagittal stratum has two layers consisting of four different fiber tracts. Its external layer consists of a long association fiber and a commissural fiber, while its internal layer consists of intertwined projection fibers, including temporo-parieto-occipitopontine fibers and the posterior thalamic peduncle. Detailed microdissection also showed the location of the posterior thalamic peduncle in the most medial site of all posterior hemispheric projection fibers. CONCLUSIONS: The structure of the sagittal stratum is distinctive in that it contains all three main fiber systems: association, commissural, and projection. Because of its expansive location in the temporal and occipital lobes, it can be damaged by most neurosurgical pathologies and procedures. The authors emphasize the significance of preserving the sagittal stratum during surgical interventions while also challenging the notion of a "silent" brain, suggesting that the current inability to fully comprehend cerebral function contributes to this misconception. Detailed knowledge of the complex white matter anatomy of the sagittal stratum can guide neurosurgeons in surgical planning and the selection of appropriate surgical approaches with intraoperative orientation for safe surgery and less comorbidity.

2.
Childs Nerv Syst ; 40(5): 1489-1499, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38294493

RESUMEN

OBJECTIVE: The study focused on assessing the potential neurocognitive and social developmental issues in children with non-syndromic craniosynostosis (NSC) who received optimal surgical treatment. The primary objective was to determine whether NSC, even after optimal surgical treatment, could have negative effects on brain development. METHODS: The study included a total of 73 pediatric patients aged between 2 and 6 years who had previously undergone surgery for NSC at the Gazi University Faculty of Medicine, Department of Neurosurgery. These patients were carefully matched with 107 healthy children who visited the outpatient clinic of the same department in terms of sociodemographic characteristics such as age, gender, and social status. To assess the neurocognitive and social development of the participants, the child psychologist administered a developmental scale to the child and his/her family via video conference. This scale was adapted from the Bayley-III Infant and Child Development Scale by the Gazi University Faculty of Medicine, Division of Pediatric Neurology. RESULTS: The study found no social or gross motor developmental issues in patients who had undergone optimal surgical treatment for NSC. However, the risk of fine motor developmental deficiencies was 4.79 times higher than that of the normal population, and the risk of language developmental deficiencies was 5.75 times higher than that of the normal population. CONCLUSIONS: Despite timely treatment of NSC, long-term neurocognitive and social development issues may arise in affected children. Therefore, it is crucial to monitor these patients after completing surgical treatment and thoroughly examine their development using a multidisciplinary approach.


Asunto(s)
Craneosinostosis , Cambio Social , Humanos , Niño , Lactante , Masculino , Femenino , Preescolar , Discapacidades del Desarrollo , Craneosinostosis/cirugía , Desarrollo Infantil , Desarrollo del Lenguaje
3.
Cortex ; 171: 40-59, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-37979231

RESUMEN

The fiber dissection technique is one of the earliest methods used to demonstrate the internal structures of the brain, but until the development of fiber tractography, most neuroanatomy studies were related to the cerebral cortex and less attention was given to the white matter. During the historical evolution of white matter dissection, debates have arisen about tissue preservation methods, dissection methodology, nomenclature, and efforts to adopt findings from primates to the human brain. Since its first description, the sagittal stratum has been one of the white matter structures subject to controversy and has not been sufficiently considered in the literature. With recent functional studies suggesting potential functions of the sagittal stratum, the importance of attaining a precise understanding of this structure and its constituent fiber tracts is further highlighted. This study revisits the historical background of white matter dissection, unveils the early synonymous descriptions of the sagittal stratum, and provides a systematic review of the current literature. Through evaluation of the historical statements about the sagittal stratum, we provide an understanding of the divergence and explain the reasons for the ambiguity. We believe that acquiring such an understanding will lead to further investigations on this subject, which has the potential to benefit in addressing various neuropsychiatric conditions, maintaining functional connectivity, and optimizing surgical outcomes.


Asunto(s)
Sustancia Blanca , Animales , Humanos , Sustancia Blanca/anatomía & histología , Encéfalo/anatomía & histología , Disección/métodos , Corteza Cerebral , Neuroanatomía
5.
Medicine (Baltimore) ; 102(27): e34005, 2023 Jul 07.
Artículo en Inglés | MEDLINE | ID: mdl-37417623

RESUMEN

Tumors of the pineal region (TPRs) are rare neoplasms that are surgically challenging to resect. Conventional treatment strategies are available, but gamma knife radiosurgery (GKRS) is an alternative approach. This study presents a single-center experience with GKRS performed for TPR with and without histopathological diagnoses. The cases of 25 patients with TPRs treated with GKRS were retrospectively analyzed. Thirteen of these 25 patients had histopathological confirmation, and 13 had elevated serum alpha-fetoprotein and beta-human chorionic gonadotropin levels. The 25 patients had a mean follow-up duration of 61 months. The total response rate to GKRS was 60%, and a 53.8% decrease in the alpha-fetoprotein and beta human chorionic gonadotropin levels was observed. The findings of this study indicate that GKRS is a safe procedure for TPRs, even in the event of insufficient histopathological findings. This treatment approach provides increased Karnofsky performance scores and an extended life expectancy.


Asunto(s)
Neoplasias Encefálicas , Glándula Pineal , Pinealoma , Radiocirugia , Humanos , Estudios de Seguimiento , Radiocirugia/métodos , alfa-Fetoproteínas , Pinealoma/radioterapia , Pinealoma/cirugía , Estudios Retrospectivos , Glándula Pineal/cirugía , Glándula Pineal/patología , Neoplasias Encefálicas/radioterapia , Neoplasias Encefálicas/cirugía , Neoplasias Encefálicas/patología , Gonadotropina Coriónica , Resultado del Tratamiento
6.
J Neurosurg Case Lessons ; 5(19)2023 May 08.
Artículo en Inglés | MEDLINE | ID: mdl-37158388

RESUMEN

BACKGROUND: The aim of this paper is to report one of the significant applications of artificial intelligence (AI) and how it affects everyday clinical practice in neurosurgery. The authors present a case in which a patient was diagnosed via an AI algorithm during ongoing magnetic resonance imaging (MRI). According to this algorithm, the corresponding physicians were immediately warned, and the patient received prompt appropriate treatment. OBSERVATIONS: A 46-year-old female presenting with nonspecific headache was admitted to undergo MRI. Scanning revealed an intraparenchymal mass that was detected by an AI algorithm running on real-time patient data while the patient was still in the MRI scanner. The day after MRI, a stereotactic biopsy was performed. The pathology report confirmed an isocitrate dehydrogenase wild-type diffuse glioma. The patient was referred to the oncology department for evaluation and immediate treatment. LESSONS: This is the first report of a glioma diagnosed by an AI algorithm and a subsequent prompt operation in the literature-the first of many and an example of how AI will enhance clinical practice.

7.
Bone Joint J ; 105-B(4): 400-411, 2023 03 15.
Artículo en Inglés | MEDLINE | ID: mdl-36924174

RESUMEN

The aim of this study was to determine whether early surgical treatment results in better neurological recovery 12 months after injury than late surgical treatment in patients with acute traumatic spinal cord injury (tSCI). Patients with tSCI requiring surgical spinal decompression presenting to 17 centres in Europe were recruited. Depending on the timing of decompression, patients were divided into early (≤ 12 hours after injury) and late (> 12 hours and < 14 days after injury) groups. The American Spinal Injury Association neurological (ASIA) examination was performed at baseline (after injury but before decompression) and at 12 months. The primary endpoint was the change in Lower Extremity Motor Score (LEMS) from baseline to 12 months. The final analyses comprised 159 patients in the early and 135 in the late group. Patients in the early group had significantly more severe neurological impairment before surgical treatment. For unadjusted complete-case analysis, mean change in LEMS was 15.6 (95% confidence interval (CI) 12.1 to 19.0) in the early and 11.3 (95% CI 8.3 to 14.3) in the late group, with a mean between-group difference of 4.3 (95% CI -0.3 to 8.8). Using multiply imputed data adjusting for baseline LEMS, baseline ASIA Impairment Scale (AIS), and propensity score, the mean between-group difference in the change in LEMS decreased to 2.2 (95% CI -1.5 to 5.9). Compared to late surgical decompression, early surgical decompression following acute tSCI did not result in statistically significant or clinically meaningful neurological improvements 12 months after injury. These results, however, do not impact the well-established need for acute, non-surgical tSCI management. This is the first study to highlight that a combination of baseline imbalances, ceiling effects, and loss to follow-up rates may yield an overestimate of the effect of early surgical decompression in unadjusted analyses, which underpins the importance of adjusted statistical analyses in acute tSCI research.


Asunto(s)
Traumatismos de la Médula Espinal , Traumatismos Vertebrales , Humanos , Traumatismos de la Médula Espinal/complicaciones , Traumatismos de la Médula Espinal/cirugía , Descompresión Quirúrgica/métodos , Europa (Continente) , Procedimientos Neuroquirúrgicos/métodos , Traumatismos Vertebrales/cirugía , Recuperación de la Función , Resultado del Tratamiento
8.
Childs Nerv Syst ; 39(5): 1323-1328, 2023 05.
Artículo en Inglés | MEDLINE | ID: mdl-36400977

RESUMEN

PURPOSE: Patients with mucopolysaccharidosis type IVA (MPS IVA) have many risk factors for myelopathy and paresis. These are spinal cord compression, bone stenosis, and soft tissue thickening with ligament laxity, deformity, odontoid hypoplasia, and atlantoaxial instability. Although most patients with MPS IVA appear generally healthy at birth, patients often show skeletal deformities within a few years. Surgical indications are difficult to determine. Historically, many physicians have used prophylactic decompression and fusion in young, asymptomatic MPS IVA patients to prevent cord compression. Although spinal cord decompression is usually required at the craniocervical junction in patients with MPS IVA, decompression may be required at other spinal cord levels as well. There is a risk of developing neurological damage during surgery. The most common causes are ischemia secondary to cardiac output deteriorated in the prone position or due to artery damage, and local trauma due to neck movements or traction while bringing the patient to the prone position. Neurophysiological monitoring is very important during surgery to reduce the risk of neurological damage in spinal cord surgery. In this case report, a case with loss of lower extremity neuromonitorization motor evoked potential (MEP) responses in the early period of surgery without any intervention to the craniocervical junction after prone positioning will be presented.


Asunto(s)
Mucopolisacaridosis IV , Compresión de la Médula Espinal , Enfermedades de la Médula Espinal , Recién Nacido , Humanos , Mucopolisacaridosis IV/complicaciones , Compresión de la Médula Espinal/etiología , Enfermedades de la Médula Espinal/complicaciones , Cuadriplejía/etiología , Cuadriplejía/prevención & control , Cuadriplejía/cirugía
9.
Ann Plast Surg ; 89(4): 385-390, 2022 10 01.
Artículo en Inglés | MEDLINE | ID: mdl-36149978

RESUMEN

BACKGROUND: Although many fixation methods are used alone or in combination for craniosynostosis, only few studies have compared the effectiveness and long-term results of these methods. METHOD: In this study, patients in whom suture or resorbable plate-screw system was used for fixation were evaluated in terms of postoperative results and complications. The data of patients who underwent surgery for craniosynostosis between 2002 and 2019 were retrospectively reviewed and evaluated. RESULTS: A total of 70 patients, 41 in the suture group and 29 in the resorbable plate-screw group, were included in the study. Whitaker classification was used for head shape evaluation, and anthropometric head circumference measurements were performed in all patients in the preoperative and postoperative periods. In the postoperative period, all patients were compared in terms of the operation time, transfusion requirement, discharge, follow-up period, and complications according to the chosen fixation method.The mean age, postoperative complication rates, anthropometric head circumference measurements, and Whitaker scores of both groups were found to be statistically similar. Although the resorbable plate-screw group had a longer follow-up period, the operation time was longer in the suture group. Furthermore, the suture group had lower transfusion requirement and earlier discharge from the hospital than the resorbable plate-screw group. CONCLUSIONS: If fixation with suture is chosen in suitable patients, in addition to the low patient cost, this method can be safely applied in centers with limited logistical possibilities, because of the results and complication rates being similar to fixation with resorbable plate-screws.


Asunto(s)
Tornillos Óseos , Craneosinostosis , Placas Óseas , Craneosinostosis/cirugía , Fijación Interna de Fracturas , Humanos , Estudios Retrospectivos , Suturas , Resultado del Tratamiento
10.
Br J Neurosurg ; : 1-6, 2022 Feb 08.
Artículo en Inglés | MEDLINE | ID: mdl-35132932

RESUMEN

PURPOSE: Sagittal imbalance is common in degenerative and congenital spinal diseases. Some studies have examined spinal deformities in the spina bifida. However, sagittal spinopelvic parameters in tethered cord syndrome (TCS) and split cord malformation (SCM) have been poorly evaluated in the literature. In this study, we investigated sagittal spinopelvic differences in TCS due to fatty filum terminale and SCM patients. MATERIAL AND METHODS: A total of 78 patients with spina bifida occulta (30 SCM and 48 TCS due to fatty filum terminale) were included in the study. Radiological images of these patients were retrospectively evaluated. We evaluated the pelvic incidence, pelvic tilt, sacral slope, sagittal vertical axis (SVA), T1 pelvic angle, lumbar lordosis (LL), thoracic kyphosis, thoracolumbar alignment, and change in those parameters with age. RESULTS: Correlation coefficients between age and LL, T1 pelvic angle, and the SVA in patients with TCS due to fatty filum terminale were statistically significant. In addition, correlation coefficients between age and LL and the SVA in patients with SCM were statistically significant. Notably, LL was increased at a statistically significant level with age in patients with TCS and SCM. CONCLUSION: Improved knowledge of spinal balance parameters in patients with TCS and SCM may be helpful in understanding the clinical course of these pathologies, and provide information regarding the success of surgery at the follow-up period.

11.
Turk Neurosurg ; 32(1): 16-21, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-34542897

RESUMEN

AIM: To describe a deep convolutional generative adversarial networks (DCGAN) model which learns normal brain MRI from normal subjects than finds distortions such as a glioma from a test subject while performing a segmentation at the same time. MATERIAL AND METHODS: MRIs of 300 healthy subjects were employed as training set. Additionally, test data were consisting anonymized T2-weigted MRIs of 27 healthy subjects and 27 HGG patients. Consecutive axial T2-weigted MRI slices of every subject were extracted and resized to 364x448 pixel resolution. The generative model produced random normal synthetic images and used these images for calculating residual loss to measure visual similarity between input MRIs and generated MRIs. RESULTS: The model correctly detected anomalies on 24 of 27 HGG patients? MRIs and marked them as abnormal. Besides, 25 of 27 healthy subjects? MRIs in the test dataset detected correctly as healthy MRI. The accuracy, precision, recall, and AUC were 0.907, 0.892, 0.923, and 0.907, respectively. CONCLUSION: Our proposed model demonstrates acceptable results can be achieved only by training with normal subject MRIs via using DCGAN model. This model is unique because it learns only from normal MRIs and it is able to find any abnormality which is different than the normal pattern.


Asunto(s)
Inteligencia Artificial , Glioma , Glioma/diagnóstico por imagen , Humanos , Procesamiento de Imagen Asistido por Computador , Imagen por Resonancia Magnética , Redes Neurales de la Computación
12.
J Neurosurg ; 136(3): 655-661, 2022 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-34450585

RESUMEN

OBJECTIVE: Cerebral cavernous malformation (CM) is an angiographically occult vascular pathology. Although microsurgery is the gold standard treatment to control the symptoms of CM, resection carries high risk in some situations, especially eloquent areas. The objective was to evaluate annual hemorrhage rates (AHRs) before and after stereotactic radiosurgery (SRS) treatment of cerebral CM in different locations. METHODS: A total of 195 patients (119 women and 76 men) with CM treated at the Gazi University Gamma Knife Center between April 2005 and June 2017 were analyzed. The mean ± SD follow-up period was 67.4 ± 31.1 months (range 12 days to 170 months). AHR before SRS, AHR after SRS, morbidity associated with radiation, seizure control rate after SRS, lesion volume, coexistence with developmental venous anomaly, and SRS treatment parameters were analyzed, with evaluation of radiological data and clinical charts performed retrospectively. The seizure control rate was assessed using the Engel outcome scale. RESULTS: The AHR before SRS was 15.3%. Application of SRS to these patients significantly reduced the AHR rates to 2.6% during the first 2 years after treatment and to 1.4% thereafter. Favorable seizure control (Engel class I and II) after radiosurgery was achieved in 23 patients (88.5%) with epilepsy. Radiation-related temporary complications occurred in 15.4% of patients, and permanent morbidity occurred in 4.6%. CONCLUSIONS: SRS is a safe and effective treatment modality for reducing the hemorrhage risk of CM. The authors suggest that SRS should be considered for the treatment of patients with CM, high surgical risks, and hemorrhage history, instead of a using a wait-and-see policy.


Asunto(s)
Hemangioma Cavernoso del Sistema Nervioso Central , Malformaciones Arteriovenosas Intracraneales , Traumatismos por Radiación , Radiocirugia , Femenino , Estudios de Seguimiento , Hemangioma Cavernoso del Sistema Nervioso Central/complicaciones , Hemangioma Cavernoso del Sistema Nervioso Central/radioterapia , Hemangioma Cavernoso del Sistema Nervioso Central/cirugía , Hemorragia , Humanos , Malformaciones Arteriovenosas Intracraneales/complicaciones , Malformaciones Arteriovenosas Intracraneales/diagnóstico por imagen , Malformaciones Arteriovenosas Intracraneales/radioterapia , Masculino , Traumatismos por Radiación/etiología , Radiocirugia/efectos adversos , Estudios Retrospectivos , Convulsiones/etiología , Resultado del Tratamiento
13.
J Chemother ; 33(7): 509-516, 2021 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-34013828

RESUMEN

Nosocomial meningitis caused by Gram-negative bacteria is associated with increasingly common neurosurgical procedures in children, with an increase in incidence recently reported. These infections are associated with an increased risk of mortality, prolonged hospitalisation, and increased costs. In this report, we describe two paediatric cases with central nervous system infections caused by extensively drug-resistant Gram-negative bacteria that were successfully treated with intraventricular colistin. To the best of our knowledge, this is the first comprehensive review and discussion of intraventricular antimicrobial therapy in a paediatric population. Based on our comprehensive review of the relevant literature, it appears that intraventricular administration of colistin may be a promising and effective option in the treatment of central nervous system infections in children who do not respond to other treatment options.


Asunto(s)
Infecciones por Acinetobacter/tratamiento farmacológico , Antibacterianos/uso terapéutico , Colistina/uso terapéutico , Meningitis Bacterianas/tratamiento farmacológico , Infecciones por Pseudomonas/tratamiento farmacológico , Antibacterianos/administración & dosificación , Antibacterianos/efectos adversos , Preescolar , Colistina/administración & dosificación , Colistina/efectos adversos , Infección Hospitalaria , Farmacorresistencia Bacteriana Múltiple , Femenino , Humanos , Lactante , Inyecciones Intraventriculares , Masculino
14.
Turk Neurosurg ; 31(4): 519-529, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33978200

RESUMEN

AIM: To analyze the results of stereotactic radiosurgery in 295 patients with residual Grade I meningiomas located at parasellar region, petroclival region, cerebellopontine angle and parasagittal region. MATERIAL AND METHODS: A total of 295 patients with Grade 1 residual Meningiomas (197 women, 98 men), who were treated by adjuvant radiosurgery in Gazi University Gamma Knife Center between 2004-2015 were analyzed. WHO Grade 2 and 3 meningiomas were not included in our study. Minimum radiological follow-up was 24 months. The median follow-up was 54 months. The tumor volume, location, treatment dose, morbidity, progression free survival and tumor control rate were analyzed. RESULTS: The median tumor volume was 5.2 cm3 (0.04-39.7), median age was 50 (20-80), median dose was 14 Gy and tumor control rate was 94.5% (stationary in 85.0%, volume reduction in 9.5%). Increase in tumor volume was seen in 16 patients (5.5%) and re-operation was performed in 5 of them (1.6%). Stereotactic radiosurgery was performed again for 8 patients (2.7%).The location of the tumors was as follows: 39.3% parasellar region, 20% cerebellopontine angle, 13.6% petroclival and 27.1% was parasagittal, falcine or convexity. Major morbidities were detected in 6 (2%) patients. Minor morbidities were detected in 18 (6.1%) patients. CONCLUSION: Stereotactic radiosurgery is an effective and safe treatment modality for residual Grade I meningiomas.


Asunto(s)
Neoplasias Meníngeas/radioterapia , Meningioma/radioterapia , Radiocirugia , Adulto , Anciano , Anciano de 80 o más Años , Terapia Combinada , Enfermedad Crítica/epidemiología , Enfermedad Crítica/terapia , Progresión de la Enfermedad , Femenino , Estudios de Seguimiento , Humanos , Masculino , Neoplasias Meníngeas/epidemiología , Neoplasias Meníngeas/patología , Neoplasias Meníngeas/cirugía , Meningioma/epidemiología , Meningioma/patología , Meningioma/cirugía , Persona de Mediana Edad , Procedimientos Neuroquirúrgicos , Radiocirugia/efectos adversos , Radiocirugia/métodos , Radiocirugia/estadística & datos numéricos , Reoperación/estadística & datos numéricos , Estudios Retrospectivos , Resultado del Tratamiento , Carga Tumoral , Adulto Joven
16.
Neurosurg Focus ; 49(6): E15, 2020 12.
Artículo en Inglés | MEDLINE | ID: mdl-33260123

RESUMEN

OBJECTIVE: During the coronavirus disease 2019 (COVID-19) pandemic, neurosurgeons all around the globe continue to operate in emergency cases using new self-protective measures. Personal protective equipment (PPE) use is recommended in all surgeries. The authors have experienced varying degrees of field of view (FOV) loss under the surgical microscope with different PPE. Herein, they aimed to investigate the effects of different PPE on FOV while using the surgical microscope. METHODS: Fifteen neurosurgeons and neurosurgery residents participated in this study. Three kinds of PPE (safety spectacles, blast goggles, and face shields) were tested while using a surgical microscope. FOV was measured using a 12 × 12-cm checkered sheet of paper on which every square had an area of 25 mm2 under the microscope. The surgical microscope was positioned perpendicular to the test paper, and the zoom was fixed. Each participant marked on the test sheet the peripheral borders of their FOV while using different PPE and without wearing any PPE. A one-way repeated-measures ANOVA was performed to determine if there was a significant difference in FOV values with the different PPE. RESULTS: FOV was significantly different between each PPE (F[3, 42] = 6339.845, p < 0.0005). Post hoc analysis revealed a significant decrease in the FOV from the naked eye (9305.33 ± 406.1 mm2) to blast goggles (2501.91 ± 176.5 mm2) and face shields (92.33 ± 6.4 mm2). There were no significant FOV changes with the safety spectacles (9267.45 ± 410.5 mm2). CONCLUSIONS: While operating under a surgical microscope safety spectacles provide favorable FOVs. Face shields increase the eye piece-pupil distance, which causes a severe reduction in FOV.


Asunto(s)
COVID-19/prevención & control , Microcirugia/tendencias , Neurocirujanos/tendencias , Procedimientos Neuroquirúrgicos/tendencias , Equipo de Protección Personal/tendencias , Campos Visuales , COVID-19/transmisión , Humanos , Microscopía/instrumentación , Microscopía/tendencias , Microcirugia/instrumentación , Procedimientos Neuroquirúrgicos/instrumentación , Equipo de Protección Personal/efectos adversos , Campos Visuales/fisiología
17.
World Neurosurg ; 144: e210-e220, 2020 12.
Artículo en Inglés | MEDLINE | ID: mdl-32822951

RESUMEN

BACKGROUND: Bevacizumab, an anti-vascular endothelial growth factor (VEGF) antibody, is a new treatment approach for radionecrosis. In our study, we compared the prophylactic and therapeutic usage of a promising agent, ramipril (an angiotensin-converting enzyme inhibitor), with that of bevacizumab for reducing radiation-induced brain injury after high-dose stereotactic radiosurgery (SRS). METHODS: A total of 60 Wistar rats were used. The rats were irradiated with a single dose of 50 Gy using a Leksell Gamma Knife device. Bevacizumab and ramipril were administered in the prophylactic protocol (starting the first day of SRS) and in the therapeutic protocol (starting the fourth week of SRS). Their usage was continued until 12 weeks, and the right frontal lobes of the rats were examined histologically (hematoxylin and eosin stain) and immunohistochemically (hypoxia-inducible factor [HIF]-1α, VEGF, and CD31 antibody expression). RESULTS: The expression of VEGF, HIF-1α, and CD31 had significantly increased at 12 weeks after SRS compared with the control group. The addition of bevacizumab or ramipril to SRS significantly mitigated the histological severity of radiation injury and the expression of VEGF, HIF-1α, and CD31. However, the prophylactic use of bevacizumab and ramipril seemed to be more effective than therapeutic administration. Our results also revealed that the greatest benefit was achieved with the use of prophylactic administration of bevacizumab compared with other treatment protocols. CONCLUSIONS: Ramipril might be a promising agent for patients with radionecrosis. Clinical studies are required to investigate the effective and safe doses of ramipril, which is an inexpensive, well-tolerated drug that can cross the blood-brain barrier.


Asunto(s)
Inhibidores de la Angiogénesis/uso terapéutico , Inhibidores de la Enzima Convertidora de Angiotensina/uso terapéutico , Bevacizumab/uso terapéutico , Encéfalo/patología , Encéfalo/efectos de la radiación , Traumatismos Experimentales por Radiación/patología , Traumatismos Experimentales por Radiación/prevención & control , Radiocirugia/efectos adversos , Ramipril/uso terapéutico , Animales , Lóbulo Frontal/patología , Subunidad alfa del Factor 1 Inducible por Hipoxia/biosíntesis , Subunidad alfa del Factor 1 Inducible por Hipoxia/efectos de los fármacos , Inmunohistoquímica , Masculino , Necrosis/prevención & control , Molécula-1 de Adhesión Celular Endotelial de Plaqueta/biosíntesis , Molécula-1 de Adhesión Celular Endotelial de Plaqueta/efectos de los fármacos , Ratas , Ratas Wistar , Factor A de Crecimiento Endotelial Vascular/biosíntesis , Factor A de Crecimiento Endotelial Vascular/efectos de los fármacos
18.
Turk J Med Sci ; 50(8): 2005-2016, 2020 12 17.
Artículo en Inglés | MEDLINE | ID: mdl-32682355

RESUMEN

Background/aim: Altered iron metabolism is one of the pathophysiological mechanisms occurring during hypoxic injuries in the central nervous system. Proper homeostasis of cellular iron is regulated by iron import, storage, and export proteins that prevent excess iron overload or iron starvation in cells. Therapeutic hypothermia is an approved treatment for hypoxic ischemia in newborns, but the underlying molecular mechanism is still unknown. We studied the effects of hypoxia, preceded with preconditioning, on the iron homeostasis of glial cells, known as a major actor in the inflammatory process during perinatal brain injury. Materials and methods: Primary microglia and astrocytes in culture were exposed to 12 h of hypoxia with or without mild hypothermic preconditioning. The mRNA expression was assessed using qPCR. Iron accumulation was visualized via modified Perl's histochemistry. Cytokine levels in cell cultures were measured using ELISA. Results: Hypothermic preconditioning enhanced microglial viability, which previously was decreased in both cell types due to hypoxia. Hypoxia increased iron accumulation in the mixed glial cells and in ferritin expression in both microglia and astrocytes. Hypotermic preconditioning decreased the elevated ferritin-light chain expression significantly in microglia. Iron importer proteins, DMT1 and TfR1, both increased their mRNA expression after hypoxia, and hypothermic preconditioning continued to support the elevation of DMT1 in both glial cell types. Ferroportin expression increased as a survival factor of the glial cell following hypoxia. Hypothermic preconditioning supported this increase in both cell types and was especially significant in astrocytes. IL-10 levels were prominently increased in cell culture after hypothermic preconditioning. Conclusion: The data suggest that hypothermic preconditioning affects cellular iron homeostasis by regulating the storage and transfer proteins of iron. Regulation of the cellular iron traffic may prevent glial cells from experiencing the detrimental effects of hypoxia-related inflammation.


Asunto(s)
Encéfalo/metabolismo , Homeostasis/fisiología , Hipotermia Inducida/métodos , Hipoxia/fisiopatología , Hipoxia/terapia , Hierro/metabolismo , Neuroglía/metabolismo , Femenino , Humanos , Hipoxia/metabolismo , Recién Nacido , Masculino , Resultado del Tratamiento
19.
BMC Pediatr ; 20(1): 183, 2020 04 24.
Artículo en Inglés | MEDLINE | ID: mdl-32331522

RESUMEN

BACKGROUND: Sotos syndrome is caused by a gene deletion with an autosomal dominant pattern of inheritance. The Sotos syndrome was first described by Juan Sotos. Cole and Hughes identified the clinical characteristics of this syndrome. This syndrome is characterized by macrocephaly, frontal bossing, ocular hypertelorism, overgrowth, subdural hygroma, ventricular dilatation, agenesis of the corpus callosum. This syndrome is associated with mutations in NSD 1 (nuclear receptor SET domain-containing protein 1) gene, protein insufficiency, and a 5q35 microdeletion. Sotos syndrome is reported to occur in approximately 1/10,000-15,000 births. CASE PRESENTATION: We present a patient with Sotos syndrome who is harboring a sacral lipoma and tethered cord syndrome and she had growth retardation, frontal bossing and hypertelorism. After a standard approach for tethered cord syndrome, the patient was discharged 3 days after without any additional neurodeficits. CONCLUSION: In the literature, sacral lipoma and tethered cord syndrome with Sotos syndrome have not been published yet.


Asunto(s)
Defectos del Tubo Neural , Síndrome de Sotos , Femenino , Humanos , Mutación , Síndrome de Sotos/complicaciones , Síndrome de Sotos/diagnóstico , Síndrome de Sotos/genética
20.
Clin Neurol Neurosurg ; 194: 105830, 2020 07.
Artículo en Inglés | MEDLINE | ID: mdl-32302787

RESUMEN

OBJECTIVES: Cerebral cavernous malformations (CMs) are benign vascular hamartomas of central nervous system. Although they are mostly asymptomatic, they may occasionally result in life-threatening complications leading to surgical treatment. The main goal is to evaluate the surgical outcomes of operated pediatric cerebral CMs in our clinic and compare our results with the literature. PATIENTS AND METHODS: The data of 29 pediatric patients who were operated for cerebral CMs in our clinic between 2007 and 2016 were collected. RESULTS: Of 29 patients, 13 were girls and 16 were boys, and the mean age at operation was 11.4 years (range from 2 to 17 years). Main symptoms at presentation were seizures (15 patients, 51.7 %), headache (12 patients, 41.3 %), and focal neurological deficits (4 patients, 13.7 %). The frequency of hemorrhage in CMs was significantly higher in younger patients (p = 0.019). Total excision was achieved in all patients. The mean follow-up period was 27.3 months (range from 12 to 97 months). New neurological deficit following surgery occurred in 1 patient (3.4 %) who completely recovered after 3 months. After surgery, 1 patient (3.4 %) has become free of preoperative deficit; while the rest (27 patients) remained in preoperative neurological status. Of 15 patients presented with seizures preoperatively, 10 patients (66.6 %) were seizure free (Engel Class 1), 4 (26.6 %) were "almost seizure free" (Engel Class 2) and one (6.6 %) experienced "worthwhile improvement" (Engel Class 3) at the last follow up visit. There was no mortality in our series. CONCLUSION: Although management of cerebral CMs in childhood is controversial, total resection ensures good clinical outcome and seizure control. In addition, age can be a predisposing factor for hemorrhage.


Asunto(s)
Hemangioma Cavernoso del Sistema Nervioso Central/cirugía , Malformaciones Arteriovenosas Intracraneales/cirugía , Adolescente , Envejecimiento , Niño , Preescolar , Femenino , Estudios de Seguimiento , Hamartoma/cirugía , Cefalea/etiología , Hemangioma Cavernoso del Sistema Nervioso Central/diagnóstico por imagen , Humanos , Malformaciones Arteriovenosas Intracraneales/diagnóstico por imagen , Masculino , Enfermedades del Sistema Nervioso/etiología , Procedimientos Neuroquirúrgicos/métodos , Estudios Retrospectivos , Convulsiones/etiología , Resultado del Tratamiento
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