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The obstructing tracheobronchial lesion or mass may rarely be the manifestation of the disease. We describe a case of pulmonary Langerhans cell histiocytosis presenting as multiple obstructing bronchial lesions and pulmonary masses in a 36\u2010year\u2010old man. This case represents an extremely rare manifestation of pulmonary Langerhans cell histiocytosis.<\/jats:p>","DOI":"10.1111\/crj.70194","type":"journal-article","created":{"date-parts":[[2026,5,12]],"date-time":"2026-05-12T12:54:13Z","timestamp":1778590453000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Pulmonary Langerhans Cell Histiocytosis Presenting as Multiple Obstructing Bronchial Lesions and Pulmonary Masses"],"prefix":"10.1111","volume":"20","author":[{"given":"Jingyuan","family":"Fan","sequence":"first","affiliation":[{"name":"Department of Respiratory and Critical Care Medicine The First People's Hospital of Yunnan Province  Kunming China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Respiratory and Critical Care Medicine The First People's Hospital of Yunnan Province  Kunming China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhen","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Respiratory and Critical Care Medicine The First People's Hospital of Yunnan Province  Kunming China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5196-8199","authenticated-orcid":false,"given":"Danxiong","family":"Sun","sequence":"additional","affiliation":[{"name":"Department of Respiratory and Critical Care Medicine The First People's Hospital of Yunnan Province  Kunming China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,5,12]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/cas.13817"},{"issue":"6","key":"e_1_2_10_3_1","first-page":"322","article-title":"Updated AWMF Guideline on the Diagnosis and Treatment of Langerhans Cell Histiocytosis in Children and Adolescents","volume":"235","author":"Lehrnbecher T.","year":"2023","journal-title":"Klinische P\u00e4diatrie"},{"issue":"9","key":"e_1_2_10_4_1","article-title":"Pulmonary Langerhans Cell Histiocytosis in the Elderly Smoker","volume":"12","author":"Jeelani H. 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