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Recently, four subgroups of patients have been characterized: hepatobiliary, head and neck, Mikulicz syndrome and retroperitoneal fibrosis, who illustrate the mainly abdominal and ENT tropism of the disease. Yet, thoracic involvement is not uncommon. It can be detected in up to 30% of patients with systemic IgG4\u2010RD and is the exclusive manifestation of the disease in about 10% of cases. Clinical symptoms are nonspecific and may include dyspnoea, cough or chest pain. Chest CT findings are heterogeneous and primarily include peribronchovascular thickening, nodules, ground\u2010glass opacities and lymphadenopathy. There is no specific diagnostic test for IgG4\u2010RD thoracic involvement, which may mimic malignancy or vasculitis. Therefore, a cautious approach is needed to make an accurate diagnosis: a search for extra\u2010thoracic manifestations, elevated serum IgG4 levels, circulating levels of plasmablasts and pathologic evidence of disease is warranted. Although very suggestive, neither the presence of a polyclonal IgG4 lymphoplasmacytic infiltrate, storiform fibrosis or obliterative phlebitis are sufficient to confirm the histological diagnosis. Steroids are recommended as first\u2010line therapy. Rituximab or disease\u2010modifying antirheumatic drugs may be used in relapsed or rare cases of steroid\u2010refractory disease. In this review, we summarize current knowledge regarding the pathophysiology, epidemiology, diagnostic modalities (clinical\u2013biological\u2013imaging\u2013histopathology) and treatment of IgG4\u2010RD thoracic involvement.<\/jats:p>","DOI":"10.1111\/resp.14422","type":"journal-article","created":{"date-parts":[[2022,11,28]],"date-time":"2022-11-28T00:35:17Z","timestamp":1669595717000},"page":"120-131","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":47,"title":["Thoracic manifestations of\n                    <scp>IgG4<\/scp>\n                    \u2010related disease"],"prefix":"10.1111","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9857-9089","authenticated-orcid":false,"given":"Romain","family":"Muller","sequence":"first","affiliation":[{"name":"Internal Medicine Department, Hopital La Timone, APHM Aix Marseille University  Marseille 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