نتایج جستجو برای: craniospinal radiotherapy
تعداد نتایج: 62611 فیلتر نتایج به سال:
BACKGROUND Central neurocytoma is an uncommon benign tumor of the central nervous system. A section of these tumors have unusual aggressiveness and are termed as "atypical central neurocytomas," the definition of which is debated. Many studies in the available literature define them as tumors with elevated MIB-1 labeling index (MIB-1 LI) >2%, while some associate them with higher values of MIB-...
The feasibility of delivering craniospinal irradiation (CSI) with TomoDirect is investigated. A method is proposed to generate TomoDirect plans using standard three-dimensional (3D) beam arrangements on Tomotherapy with junctioning of these fields to minimize hot or cold spots at the cranial/spinal junction. These plans are evaluated and compared to a helical Tomotherapy and a three-dimensional...
BACKGROUND Medulloblastoma and other types of tumors that gain access to the cerebrospinal fluid can spread throughout the craniospinal axis. The purpose of this study was to devise a simple multi-compartment kinetic model using established tumor cell growth and treatment sensitivity parameters to model the complications of this spread as well as the impact of treatment with craniospinal radiot...
Radiotherapy is one of the standard treatments for medulloblastoma. However, therapeutic central nervous system irradiation in children may carry delayed side effects, such as radiation-induced tumor and vasculopathy. Here, we report the first case of coexisting meningioma and moyamoya syndrome, presenting 10 years after radiotherapy for medulloblastoma. A 13-year-old boy presented with an enha...
BACKGROUND Standard treatment for recurrent ependymomas is not defined. Re- irradiation has been proposed but its modalities and results are still to be explored. PATIENTS AND METHODS From June 1994 to December 2013, 32 pediatric patients with ependymoma were re-irradiated for local (n = 15) or metastatic (n = 17) relapses. Files were reviewed retrospectively. RESULTS Local relapses were tr...
PURPOSE To determine the event-free survival (EFS) and overall survival of children with average-risk medulloblastoma and treated with reduced-dose craniospinal radiotherapy (CSRT) and one of two postradiotherapy chemotherapies. METHODS Four hundred twenty-one patients between 3 years and 21 years of age with nondisseminated medulloblastoma (MB) were prospectively randomly assigned to treatme...
Abstract BACKGROUND No consensus exists on the optimal irradiation volume/dose for patients with metastatic CNS germinoma. We reviewed literature a potential association between different treatment modalities and survival. METHODS searched PubMed studies primary germinoma including detailed survival outcome data. used Kaplan-Meier method to estimate event-free (EFS) rates log-rank test comparis...
Importance Postoperative radiotherapy to the craniospinal axis is standard-of-care for pediatric medulloblastoma but is associated with long-term morbidity, particularly in young children. With the advent of modern adjuvant chemotherapy strategies, postoperative radiotherapy deferral has gained acceptance in children younger than 3 years, although it remains controversial in older children. O...
Central nervous system primitive neuroectodermal tumors (PNET) including cerebellar PNET (medulloblastoma, PNET/ MB) are the most common malignant brain tumors in childhood. Because of the high risk of leptomeningeal dissemination, standard postoperative treatment for PNET includes craniospinal radiotherapy and chemotherapy. Such treatment causes long-term morbidity including endocrine and grow...
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