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Although originally described in patients with cryptogenic organizing pneumonia, it has been described with several other noninfectious and infectious diseases, including fungal infections. Thus, it is imperative that a proper diagnosis be established before initiating treatment. In this article, we systematically review the literature (PubMed and Embase) for the associations of the RHS. We have also proposed a diagnostic algorithm for an approach to a patient with an RHS.<\/jats:p>","DOI":"10.4187\/respcare.03020","type":"journal-article","created":{"date-parts":[[2014,4,30]],"date-time":"2014-04-30T00:53:43Z","timestamp":1398819223000},"page":"1440-1449","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":62,"title":["Reversed Halo Sign: A Systematic Review"],"prefix":"10.1177","volume":"59","author":[{"given":"Venkata N","family":"Maturu","sequence":"first","affiliation":[{"name":"Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ritesh","family":"Agarwal","sequence":"additional","affiliation":[{"name":"Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2014,4,29]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1177\/02841851960373P289"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.2214\/ajr.180.5.1801251"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1378\/chest.115.1.275"},{"issue":"4","key":"e_1_3_2_5_2","first-page":"308","article-title":"Bronchiolitis obliterans with organizing pneumonia (BOOP), presenting as a ring-shaped opacity at HRCT (the atoll sign). 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