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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">Kazan medical journal</journal-id><journal-title-group><journal-title xml:lang="en">Kazan medical journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Казанский медицинский журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0368-4814</issn><issn publication-format="electronic">2587-9359</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">677128</article-id><article-id pub-id-type="doi">10.17816/KMJ677128</article-id><article-id pub-id-type="edn">HZMVFN</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Clinical experiences</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Обмен клиническим опытом</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">Parathyroid carcinoma: diagnosis and treatment</article-title><trans-title-group xml:lang="ru"><trans-title>Карцинома паращитовидной железы: диагностика и лечение</trans-title></trans-title-group><trans-title-group xml:lang="zh"><trans-title>甲状旁腺癌：诊断和治疗</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0001-5640-7702</contrib-id><contrib-id contrib-id-type="spin">5958-5280</contrib-id><name-alternatives><name xml:lang="en"><surname>Matyanin</surname><given-names>Maxim V.</given-names></name><name xml:lang="ru"><surname>Матянин</surname><given-names>Максим Владимирович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine), Surgeon, Depart. of Surgery № 1</p></bio><bio xml:lang="ru"><p>канд. мед. наук, врач-хирург, хирургическое отделение № 1</p></bio><email>matyanin@list.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1109-3268</contrib-id><contrib-id contrib-id-type="spin">1730-0095</contrib-id><name-alternatives><name xml:lang="en"><surname>Zhdankina</surname><given-names>Natalya V.</given-names></name><name xml:lang="ru"><surname>Жданкина</surname><given-names>Наталья Викторовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine), Assistant Professor, Depart. of Internal Diseases</p></bio><bio xml:lang="ru"><p>канд. мед. наук, доцент, каф. внутренних болезней</p></bio><email>zhdankina@unn.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0414-9104</contrib-id><contrib-id contrib-id-type="spin">7091-8394</contrib-id><name-alternatives><name xml:lang="en"><surname>Zubeev</surname><given-names>Pavel S.</given-names></name><name xml:lang="ru"><surname>Зубеев</surname><given-names>Павел Сергеевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Medicine), Chief Medical Officer</p></bio><bio xml:lang="ru"><p>д-р мед. наук, главный врач</p></bio><email>mlpu33@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">City Hospital No. 33 of the Leninsky District of Nizhny Novgorod</institution></aff><aff><institution xml:lang="ru">Городская больница № 33 Ленинского района г. Нижнего Новгорода</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Lobachevsky State University of Nizhny Novgorod</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский Нижегородский государственный университет им. Н.И. Лобачевского</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2025-06-30" publication-format="electronic"><day>30</day><month>06</month><year>2025</year></pub-date><pub-date date-type="pub" iso-8601-date="2025-08-05" publication-format="electronic"><day>05</day><month>08</month><year>2025</year></pub-date><volume>106</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>672</fpage><lpage>679</lpage><history><date date-type="received" iso-8601-date="2025-03-13"><day>13</day><month>03</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-04-18"><day>18</day><month>04</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Эко-Вектор</copyright-statement><copyright-statement xml:lang="zh">Copyright ©; 2025,</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2028-08-05"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://eco-vector.com/for_authors.php#07</ali:license_ref></license></permissions><self-uri xlink:href="https://kazanmedjournal.ru/kazanmedj/article/view/677128">https://kazanmedjournal.ru/kazanmedj/article/view/677128</self-uri><abstract xml:lang="en"><p>This paper describes the diagnostic search, treatment, and follow-up of a patient with parathyroid carcinoma. The authors analyzed the clinical signs and results of the investigations. Despite the long-term clinical presentation of urolithiasis, parathyroid hyperfunction was not suspected. Hyperparathyroidism was detected only when damage to the musculoskeletal system became clinical. The differential diagnoses included parathyroid carcinoma, iliac osteosarcoma, and anterior mediastinal tumor. The main difficulty in the verification of the diagnosis in this case was the atypical localization of the affected parathyroid gland. Conventional imaging is not effective in detecting this location of parathyroid carcinoma. Parathyroidectomy allowed for the final diagnosis of parathyroid carcinoma. Follow-up of the case after surgery revealed improvement, including less pain, improvement in parathyroid hormone and calcium levels, restoration of the iliac cortex, and reossification of the brown tumor. In general, this patient exhibited signs suggestive of parathyroid carcinoma, including very high parathyroid hormone and calcium levels, simultaneous renal and bone involvement, and a large mediastinal mass together with high corrected calcium levels. However, because the disease is rare and the tumor had an atypical localization, the diagnostic search for the tumor was long. The authors highlight the importance of early detection and a multidisciplinary approach for improving the prognosis of patients with this rare condition.</p></abstract><trans-abstract xml:lang="ru"><p>Представлено описание диагностического поиска, лечения, а также последующего динамического наблюдения у пациента с карциномой паращитовидной железы. Проведён анализ клинических проявлений, результатов лабораторных и инструментальных методов исследования. Несмотря на многолетние клинические проявления мочекаменной болезни, гиперфункция паращитовидных желёз не была заподозрена. Лишь при манифестации поражения опорно-двигательного аппарата был выявлен синдром гиперпаратиреоза. Проводилась дифференциальная диагностика таких заболеваний, как карцинома паращитовидной железы, остеосаркома подвздошной кости и опухоль переднего средостения. Основная сложность верификации диагноза в данном случае заключалась в нетипичной локализации поражённой паращитовидной железы. Обычные методы визуализации не могли быть эффективными для выявления такого расположения карциномы паращитовидной железы. Выполненная паратиреоидэктомия позволила установить окончательный диагноз карциномы паращитовидной железы. Последующее наблюдение пациента после хирургического лечения позволило отследить положительную динамику в виде уменьшения болевого синдрома, нормализации уровня паратгормона и кальция, а также восстановления кортикального слоя тела подвздошной кости с реоссификацией «бурой опухоли». В целом у данного пациента присутствовали признаки, позволяющие заподозрить карциному паращитовидной железы: очень высокий уровень паратгормона и кальция, одновременное поражение почек и костей, а также присутствие крупного медиастинального образования вместе с высоким уровнем скорректированного кальция. Однако в связи с редкостью заболевания и нетипичной локализацией опухоли диагностический поиск был долгим. Подчёркивается важность раннего выявления и мультидисциплинарного подхода для улучшения прогноза у пациентов с этим редким заболеванием.</p></trans-abstract><trans-abstract xml:lang="zh"><p>本文描述了甲状旁腺癌患者的诊断搜索，治疗和随后的动态随访。对临床表现，实验室和仪器研究方法的结果进行分析。尽管尿石症的长期临床表现，但未怀疑甲状腺功能亢进。甲状旁腺功能亢进综合征仅在肌肉骨骼系统受损的表现中显示。对甲状旁腺癌、髂骨肉瘤、纵隔前肿瘤等疾病进行鉴别诊断。在这种情况下验证诊断的主要困难是受影响的甲状旁腺的非典型定位。传统的成像技术不能有效地检测甲状旁腺癌的这个位置。进行的甲状旁腺切除术使得有可能建立甲状旁腺癌的最终诊断。手术治疗后患者的后续随访使得有可能以疼痛减轻，甲状旁腺激素和钙水平正常化的形式跟踪积极动态，以及随着"棕色肿瘤"的再乳化而恢复髂骨体皮质 一般来说，该患者有迹象表明可能怀疑甲状旁腺癌：甲状旁腺激素和钙的水平非常高，同时损害肾脏和骨骼，以及存在大纵隔形成以及高水平的调节钙。然而，由于疾病的罕见性和肿瘤的非典型位置，诊断搜索是漫长的。强调了早期发现和多学科方法改善这种罕见疾病患者预后的重要性。</p></trans-abstract><kwd-group xml:lang="en"><kwd>parathyroid carcinoma</kwd><kwd>primary hyperparathyroidism</kwd><kwd>hypercalcemia</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>карцинома паращитовидной железы</kwd><kwd>первичный гиперпаратиреоз</kwd><kwd>гиперкальциемия</kwd></kwd-group><kwd-group xml:lang="zh"><kwd>甲状旁腺癌</kwd><kwd>原发性甲状旁腺功能亢进</kwd><kwd>高钙血症</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Cetani F, Pardi E, Marcocci C. 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