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Introduction. The syndrome of posterior reversible encephalopathy syndrome (PRES) is a clinical-radiological condition caused by vasogenic brain edema due to elevated blood pressure. The development of this syndrome is associated with the toxic effect of drugs in the treatment of oncological diseases. In most cases, timely diagnosis and therapy of PRES determine the complete reversibility of symptoms. However, a poor prognosis is possible with the development of severe disabling consequences or death. In practice, there are difficulties in the diagnosis of PRES due to the lack of specificity of clinical manifestations and awareness of many doctors about the existence of this syndrome.The aim of the study was to present the clinical-radiological aspect of the syndrome of posterior reversible encephalopathy in children with oncological diseases.Materials and methods. The analysis of 8 medical histories of children with oncological pathology complicated by the syndrome of posterior reversible encephalopathy was carried out.Results. The study group was dominated by patients with hemato-oncological diseases. The development of PRES occurred during chemotherapy and in most cases was not associated with arterial hypertension. The clinical picture was dominated by such symptoms as impairment of consciousness, seizures and movement disorders in the form of paresis. When carrying out magnetic resonance imaging (MRI), the lesion of the white matter of the brain was determined, mainly in the projection of the parieto-occipital regions. During treatment, all patients showed reversibility of neurological symptoms with leveling of radiological signs.Discussion. When analyzing the clinical and radiological characteristics of PRES in children, a comparison of the data with clinical observations presented in the literature was noted. The role of chemotherapy as a triggering factor in the development of posterior reversible encephalopathy syndrome has been determined.Conclusion. The necessity of including the syndrome of posterior reversible encephalopathy in the list of differential diagnoses in patients receiving chemotherapy is shown. more...