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Common causes:<ref>URL: [http://emedicine.medscape.com/article/908045-overview http://emedicine.medscape.com/article/908045-overview]. Accessed on: 12 April 2012.</ref> | Common causes:<ref>URL: [http://emedicine.medscape.com/article/908045-overview http://emedicine.medscape.com/article/908045-overview]. Accessed on: 12 April 2012.</ref> | ||
*[[Pulmonary embolism]]. | *[[Pulmonary embolism]].<ref name=pmid23395814>{{Cite journal | last1 = Casullo | first1 = J. | last2 = Semionov | first2 = A. | title = Reversed halo sign in acute pulmonary embolism and infarction. | journal = Acta Radiol | volume = | issue = | pages = | month = Feb | year = 2013 | doi = 10.1177/0284185113475797 | PMID = 23395814 }}</ref> | ||
*[[Sickle cell disease]]. | *[[Sickle cell disease]]. | ||
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