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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Annals of Clinical and Experimental Neurology</journal-id><journal-title-group><journal-title xml:lang="en">Annals of Clinical and Experimental Neurology</journal-title><trans-title-group xml:lang="ru"><trans-title>Анналы клинической и экспериментальной неврологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-5473</issn><issn publication-format="electronic">2409-2533</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">665</article-id><article-id pub-id-type="doi">10.25692/ACEN.2020.2.13</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Clinical analysis</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Клинический разбор</subject></subj-group><subj-group subj-group-type="article-type"><subject>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Leukoencephalopathy with Brainstem and Spinal Cord Involvement and Lactate Elevation (LBSL) on Magnetic Resonance Spectroscopy: A Clinical Observation</article-title><trans-title-group xml:lang="ru"><trans-title>Лейкоэнцефалопатия с преимущественным поражением ствола мозга и спинного мозга и повышенным лактатом при магнитно-резонансной спектроскопии (LBSL): клиническое наблюдение</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kazantsev</surname><given-names>Alexander Yu.</given-names></name><name xml:lang="ru"><surname>Казанцев</surname><given-names>Александр Юрьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>engine90@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Matveeva</surname><given-names>Tatiana V.</given-names></name><name xml:lang="ru"><surname>Матвеева</surname><given-names>Татьяна Всеволодовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>engine90@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kazan State Medical University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Казанский государственный медицинский университет»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2020-06-24" publication-format="electronic"><day>24</day><month>06</month><year>2020</year></pub-date><volume>14</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>93</fpage><lpage>98</lpage><history><date date-type="received" iso-8601-date="2020-06-12"><day>12</day><month>06</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2020, Kazantsev A.Y., Matveeva T.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2020, Kazantsev A.Y., Matveeva T.V.</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="en">Kazantsev A.Y., Matveeva T.V.</copyright-holder><copyright-holder xml:lang="ru">Kazantsev A.Y., Matveeva T.V.</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/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://annaly-nevrologii.com/pathID/article/view/665">https://annaly-nevrologii.com/pathID/article/view/665</self-uri><abstract xml:lang="en"><p>Leukoencephalopathy with brainstem and spinal cord involvement and lactate elevation (LBSL) on magnetic resonance spectroscopy is a rare and little-known form of hereditary leukoencephalopathy, a significant portion of which is probably obscured by the label of primary progressive multiple sclerosis. The article presents a clinical case of an adult form of LBSL and a review of the literature on this disease, discusses the particular pyramidal syndrome lesions in LBSL and multiple sclerosis, and presents the MRI criteria for LBSL. The difficulty in differential diagnosis with Krabbe disease is highlighted. Clinical observation confirms the difficulty of diagnosing LBSL and the lack of medical awareness about this disease.</p></abstract><trans-abstract xml:lang="ru"><p>Лейкоэнцефалопатия с преимущественным поражением ствола мозга и спинного мозга и повышенным лактатом при магнитно-резонансной спектроскопии (LBSL) — редкая и малоизвестная форма наследственной лейкоэнцефалопатии, существенная часть которой, вероятно, скрывается под масками первично-прогрессирующих форм рассеянного склероза. В статье представлен клинический случай взрослой формы LBSL и обзор литературы по данному заболеванию, обсуждаются особенности поражения пирамидного синдрома при LBSL и рассеянном склерозе, представлены МРТ-критерии LBSL. Подчеркивается трудность дифференциальной диагностики с болезнью Краббе. Клиническое наблюдение подтверждает трудность диагноза LBSL и недостаточную осведомленность врачей о данном заболевании.</p></trans-abstract><kwd-group xml:lang="en"><kwd>leukoencephalopathy</kwd><kwd>hereditary leukoencephalopathy</kwd><kwd>LBSL</kwd><kwd>DARS2</kwd><kwd>spastic paraplegia of the lower limbs</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>лейкоэнцефалопатия</kwd><kwd>наследственная лейкоэнцефалопатия</kwd><kwd>LBSL</kwd><kwd>DARS2</kwd><kwd>нижний спастический парапарез</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Van der Knaap M.S., van der Voorn P., Barkhof F. et al. 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