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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">17557</article-id><article-id pub-id-type="doi">10.18786/2072-0505-2026-54-002</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">Global developmental delay with psychotic disorder at onset of late-infantile form of Niemann-Pick disease type C: A case report</article-title><trans-title-group xml:lang="ru"><trans-title>Глобальная задержка развития с психотическим расстройством в дебюте поздней инфантильной формы болезни Ниманна – Пика типа С: клиническое наблюдение</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9967-0279</contrib-id><name-alternatives><name xml:lang="en"><surname>I</surname><given-names>Dmitriy V.</given-names></name><name xml:lang="ru"><surname>И</surname><given-names>Дмитрий Витальевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, Associate Professor, Chair of Neurology and Neurosurgery; Deputy Director General for Medical Affairs</p></bio><bio xml:lang="ru"><p>канд. мед. наук, доцент кафедры неврологии и нейрохирургии; заместитель генерального директора по медицинской деятельности</p></bio><email>i.dmitry@psylogia.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5209-2440</contrib-id><name-alternatives><name xml:lang="en"><surname>Proskokova</surname><given-names>Tatiana N.</given-names></name><name xml:lang="ru"><surname>Проскокова</surname><given-names>Татьяна Николаевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, Associate Professor, Professor of Chair of Neurology and Neurosurgery</p></bio><bio xml:lang="ru"><p>д-р мед. наук, доцент, профессор кафедры неврологии и нейрохирургии</p></bio><email>proskokova2011@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Far Eastern State Medical University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Дальневосточный государственный медицинский университет» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Khabarovsk Center for the Development of Psychology and Childhood “Psylogia”</institution></aff><aff><institution xml:lang="ru">КГАНОУ «Хабаровский центр развития психологии и детства «Псилогия»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-03-31" publication-format="electronic"><day>31</day><month>03</month><year>2026</year></pub-date><volume>54</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>49</fpage><lpage>54</lpage><history><date date-type="received" iso-8601-date="2025-11-17"><day>17</day><month>11</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2026-05-26"><day>26</day><month>05</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, I D.V., Proskokova T.N.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, И Д.В., Проскокова Т.Н.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">I D.V., Proskokova T.N.</copyright-holder><copyright-holder xml:lang="ru">И Д.В., Проскокова Т.Н.</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/17557">https://almclinmed.ru/jour/article/view/17557</self-uri><abstract xml:lang="en"><p>Niemann-Pick disease type C (NP-C) is a rare, progressive, autosomal recessive neurodegenerative disorder with onset at various ages, caused by pathogenic variants in the <italic>NPC1</italic> or <italic>NPC2</italic> genes. In the late-infantile form of NP-C, the development of psychotic symptoms at onset or during the course of the disease in preschool children has not been described in the literature. We report a clinical case of a 6-year-old female patient who, from the first days of life, had prolonged jaundice, hepatosplenomegaly and haemorrhagic episodes. Early development was age-appropriate, but from the age of 4 years speech regression began, and from the age of 5 years progressive behavioral disturbances appeared. The key feature was the development of rare and severe psychotic symptoms at preschool age in the late-infantile form of NP-C: inappropriate laughing without reason, talking to a mirror, night wandering around the house, aggressive jealousy of a younger brother, grabbing a kitchen knife, self-aggression (scratching until bleeding), insomnia and withdrawal. Simultaneously, daytime enuresis, ataxia and upward gaze palsy – a pathognomonic sign of NP-C – appeared. Video-electroencephalography monitoring revealed epileptic encephalopathy with continuous spike-and-wave activity during sleep with a pharmacoresistant course. Whole-exome sequencing identified compound heterozygous mutations c.3019C&gt;G + c.3742_3745delCTCA in <italic>NPC1</italic>, and blood oxysterol levels were markedly elevated. Subsequently, pathogenetic therapy with miglustat was initiated.</p> <p>Psychotic manifestations in NP-C can mimic childhood schizophrenia or psychotic disorder, but their combination with hepatosplenomegaly, ataxia and supranuclear gaze palsy should immediately direct the physician towards biochemical and genetic testing for NP-C.</p></abstract><trans-abstract xml:lang="ru"><p>Болезнь Ниманна – Пика типа С (БНПС) – редкое нейродегенеративное прогрессирующее заболевание с дебютом в разном возрасте, аутосомно-рецессивным типом наследования, вызываемое патогенными вариантами в генах <italic>NPC1</italic> и <italic>NPC2</italic>. При поздней инфантильной форме БНПС в литературе не отмечено развития психотической симптоматики в дебюте или в течение заболевания у детей дошкольного возраста.</p> <p>Представлено клиническое наблюдение пациентки 6 лет, у которой с первых дней жизни отмечалась затяжная желтуха, гепатоспленомегалия и геморрагические эпизоды. Раннее развитие соответствовало возрасту, однако с 4 лет начался регресс речи, а с 5 лет – нарастающие поведенческие нарушения. Ключевым моментом стало развитие редкой и тяжелой психотической симптоматики в дошкольном возрасте при поздней инфантильной форме БНПС: неадекватный смех без причины, разговоры с зеркалом, ночные блуждания по дому, агрессивная ревность к младшему брату, хватание за кухонный нож, самоагрессия (царапание до крови), бессонница и замкнутость. Одновременно появились дневной энурез, атаксия и парез взора вверх – патогномоничный признак БНПС. Видеоэлектроэнцефалографический мониторинг выявил эпилептическую энцефалопатию с продолженной эпилептиформной активностью во сне с фармакорезистентным течением. Полноэкзомное секвенирование обнаружило компаунд-гетерозиготные мутации с.3019C&gt;G + c.3742_3745delCTCA в <italic>NPC1</italic>, а уровни оксистеролов в крови были резко повышены. В дальнейшем начата патогенетическая терапия миглустатом.</p> <p>Психотические проявления при БНПС могут имитировать детскую шизофрению или психотическое расстройство, но их сочетание с гепатоспленомегалией, атаксией и надъядерным парезом взора должно немедленно направлять врача на биохимический и генетический поиск БНПС.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Niemann-Pick disease type C</kwd><kwd>psychotic symptoms</kwd><kwd>hepatosplenomegaly</kwd><kwd>NPC1</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>болезнь Ниманна – Пика типа С</kwd><kwd>психотическая симптоматика</kwd><kwd>гепатоспленомегалия</kwd><kwd>NPC1</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Seker Yilmaz B, Baruteau J, Rahim AA, Gissen P. Clinical and molecular features of early infantile Niemann Pick type C disease. 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