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He was then referred for video-assisted thoracoscopic surgery pleural biopsy and pleurodesis. It revealed black pleura with abundant IgG4 positive cells. He is followed up in respiratory clinic where further discussion and treatment has commenced.<\/jats:p>","DOI":"10.1136\/bcr-2021-245796","type":"journal-article","created":{"date-parts":[[2021,9,20]],"date-time":"2021-09-20T12:11:15Z","timestamp":1632139875000},"page":"e245796","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Curious case of the unexplained exudative pleural effusion"],"prefix":"10.1136","volume":"14","author":[{"given":"Phyoe Kyaw","family":"Pyae","sequence":"first","affiliation":[{"name":"Respiratory Medicine, West Hertfordshire Hospitals NHS Trust, Watford, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rigers","family":"Cama","sequence":"additional","affiliation":[{"name":"Respiratory Medicine, West Hertfordshire Hospitals NHS Trust, Watford, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andrew 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