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The biopsy result showed picture suggestive of connective tissue disease associated follicular bronchiolitis. The patient did not have any signs or symptoms of connective tissue disease. However he was positive for Rheumatoid factor, ANA, anti-RO, anti-CCP antibodies. He was started on steroids and azathioprine. After 6 months of treatment, the size of the mass and nodules reduced by 50% and ESR was reduced to 5 from 75.<\/jats:p>","DOI":"10.1136\/bcr-2019-229273","type":"journal-article","created":{"date-parts":[[2019,7,3]],"date-time":"2019-07-03T07:25:14Z","timestamp":1562138714000},"page":"e229273","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Perplexing case of lung mass perfectly mimicking a malignancy"],"prefix":"10.1136","volume":"12","author":[{"given":"Eid Humaid","family":"Alqurashi","sequence":"first","affiliation":[{"name":"Pulmonology, King Abdullah Medical City, Mecca, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9101-4939","authenticated-orcid":false,"given":"Ahmed","family":"Sayeed","sequence":"additional","affiliation":[{"name":"Internal Medicine, King Abdullah Medical City, Mecca, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hasheema Hasheem","family":"Alsulami","sequence":"additional","affiliation":[{"name":"Internal Medicine, King Abdullah Medical City, Mecca, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hadeel Mashhour","family":"Al-Qurashi","sequence":"additional","affiliation":[{"name":"Internal Medicine, King Abdullah Medical City, Mecca, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2019,7,2]]},"reference":[{"key":"2025082712105143000_12.7.e229273.1","doi-asserted-by":"crossref","unstructured":"Tashtoush B , Okafor NC , Ramirez JF , et al . 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