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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Almanac of Clinical Medicine</journal-id><journal-title-group><journal-title xml:lang="en">Almanac of Clinical Medicine</journal-title><trans-title-group xml:lang="ru"><trans-title>Альманах клинической медицины</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2072-0505</issn><issn publication-format="electronic">2587-9294</issn><publisher><publisher-name xml:lang="en">Moscow Regional Research and Clinical Institute (MONIKI)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">1727</article-id><article-id pub-id-type="doi">10.18786/2072-0505-2022-50-054</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CLINICAL CASES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЕ НАБЛЮДЕНИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Actinic keratosis as a predictor of primary multiple synchronous squamous cell skin cancer: a clinical case</article-title><trans-title-group xml:lang="ru"><trans-title>Актинический кератоз – предиктор развития первично-множественного синхронного плоскоклеточного рака кожи: описание клинического наблюдения</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2660-0536</contrib-id><contrib-id contrib-id-type="scopus">EOO-8133-2022</contrib-id><contrib-id contrib-id-type="spin">9947-9989</contrib-id><name-alternatives><name xml:lang="en"><surname>Sedova</surname><given-names>Tatiana G.</given-names></name><name xml:lang="ru"><surname>Седова</surname><given-names>Татьяна Геннадьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, Associate Professor, Chair of Dermatology and Venereology, Medical Faculty</p></bio><bio xml:lang="ru"><p>канд. мед. наук, доцент кафедры дерматовенерологии лечебного факультета</p></bio><email>sedovca-1978@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Academician Ye.A. Wagner Perm State Medical University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Пермский государственный медицинский университет им. академика Е.А. Вагнера» Минздрава России</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2022-12-28" publication-format="electronic"><day>28</day><month>12</month><year>2022</year></pub-date><pub-date date-type="pub" iso-8601-date="2022-12-22" publication-format="electronic"><day>22</day><month>12</month><year>2022</year></pub-date><volume>50</volume><issue>7</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>455</fpage><lpage>461</lpage><history><date date-type="received" iso-8601-date="2022-09-11"><day>11</day><month>09</month><year>2022</year></date><date date-type="accepted" iso-8601-date="2022-12-27"><day>27</day><month>12</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2022, Sedova T.G.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2022, Седова Т.Г.</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="en">Sedova T.G.</copyright-holder><copyright-holder xml:lang="ru">Седова Т.Г.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://almclinmed.ru/jour/article/view/1727">https://almclinmed.ru/jour/article/view/1727</self-uri><abstract xml:lang="en"><p>We present a clinical case of a primary multiple synchronous highly differentiated keratinizing squamous cell skin cancer in an 84-year old patient with multiple actinic keratosis and actinic cheilitis. The clinical case is unique for the simultaneous development of primary multiple squamous cell carcinoma of the tip of the nose and the vermilion zone of the lower lip in a patient with a past occupational and solar burden, a light phenotype, and signs of chronic photo injury the skin. Clinical, dermatoscopic and sonographic signs of keratotic actinic keratosis were identified in the patient and confirmed by pathomorphological examination. The risk factors for malignant transformation of actinic keratosis were found, such as multiple efflorescences and a long disease history. The malignant transformation of the actinic areas manifested as rapidly progressive ulceration zones more than 1 cm in diameter, pronounced hyperkeratosis, inflammation and infiltration of the underlying tissues, increased bleeding and pain. It is to be underlined that definitive and differential diagnosis requires pathomorphological assessment of the skin biopsy sample. This clinical case indicates that patients with multiple foci of actinic keratosis should be under a lifelong follow-up by dermatovenereologists, with mandatory treatment and prevention measure.</p></abstract><trans-abstract xml:lang="ru"><p>Представлено клиническое наблюдение первично-множественного синхронного высокодифференцированного ороговевающего плоскоклеточного рака кожи у пациентки 84 лет с множественным актиническим кератозом и актиническим хейлитом. Уникальность клинического случая заключается в единовременном развитии первично-множественного плоскоклеточного рака кончика носа и красной каймы нижней губы у больной с отягощенным профессиональным и солнечным анамнезом, светлым фенотипом и признаками хронического фотоповреждения кожи. Определены клинические, дерматоскопические и ультрасонографические признаки кератотического актинического кератоза, подтвержденные патоморфологическим исследованием. Факторами риска злокачественной трансформации актинического кератоза послужили множественные эффлоресценции и многолетний анамнез заболевания. Малигнизация актинических очагов клинически проявлялась в виде быстро прогрессирующих зон изъязвления размерами более 1 см, выраженного гиперкератоза, воспаления и инфильтрации подлежащих тканей, повышенной кровоточивости и болезненности. Отметим: для установления окончательного диагноза и с целью дифференциальной диагностики необходима патоморфологическая верификация биоптата кожи. Данный клинический пример указывает на необходимость пожизненного диспансерного наблюдения дерматовенерологами пациентов с множественными очагами актинического кератоза, обязательность назначения лечения и проведения профилактических мероприятий.</p></trans-abstract><kwd-group xml:lang="en"><kwd>actinic keratosis</kwd><kwd>actinic cheilitis</kwd><kwd>squamous cell carcinoma</kwd><kwd>clinical manifestation</kwd><kwd>diagnostics</kwd><kwd>risk factors</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>актинический кератоз</kwd><kwd>актинический хейлит</kwd><kwd>плоскоклеточный рак</kwd><kwd>клиника</kwd><kwd>диагностика</kwd><kwd>факторы риска</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Khlebnikova AN, Obydenova KV, Sedova TG, Andrukhina VV. [Diagnosis of actinic keratosis by dermatoscopy]. 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