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Nevi are benign melanocytic tumors. Congenital melanocytic nevus is detected at birth or shortly after birth in 1% of infants. The nevus cells of simple nevican spread into the deep layers of the dermis. So incompletely excised nevus cells may at times continue to grow when the conventional excising technique is applied. A small pigment focus may therewith be detectable in the presence of a scar. These foci usually repeat the histological pattern of the primary nevus without any signs of malignization. The article presents an analysis of the data surgical approaches in the treatment nevus of the dermis. There are ways of improving surgical method of treatment of primary tumor based on research in the field of microarchitectonics of the skin. The aim: to increase the effectiveness of determining the degree of radicalism of removal of pigmental nevi in children, taking into account the thickness of the hypoderma in different anatomical areas of the body. Materials and methods of research. The work was carried out on the basis of the department of oncohematology of Vinnytsia Regional Children’s Clinical Hospital in the period from 2018 to 2020. Clinical distribution of features of surgical interventions in pigmented skin nevi involved analysis of data of medi cal cards of patients (120 documents). The age of patients of both sexes was between 3 and 16 years old. Patients with localization of pigmented neoplasms in different areas of the extremities (68 observations) and the trunk (52 children) were subject to analysis. Conclusions. The proposed methodology for determining the radicalism of removing pigmented skin nevi by mathematically calculating the ratios of the areas of the removed tissues at the skin level and at the level of aponeurosis, taking into account the thickness of the hypoderma in different parts of the body, allow you to clearly calculate the individual parameters of the operating wound. The research was carried out in accordance with the principles of the Helsinki Declaration. The study protocol was approved by the Local Ethics Committee of participating institution. The informed consent of the patient was obtained for conducting the studies. Key words: children, surgical treatment, nevus, skin, primary tumor.

Method of determining the degree of radicalism removal of pigment skin nevuses in children