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The incidence of mastoid effusion on 3.0\u00a0T\u2014temporal bone MRI, which was conducted within 10\u00a0days after the onset of acute facial nerve palsy, was compared between 131 patients with BP and 33 patients with RHS. Findings of mastoid cavity on temporal bone MRI were classified into three groups as normal mastoid, mastoid effusion, and sclerotic change, and the incidence of ipsilesional mastoid effusion was significantly higher in RHS than BP (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001). Tympanic membrane was normal in 7 of 14 RHS patients with mastoid effusion, and injected without middle ear effusion in 7 patients. This study highlights significantly higher incidence of ipsilesional mastoid effusion in RHS than BP, and suggests that the presence of mastoid effusion may provide additional information for differential diagnosis between RHS and BP.<\/jats:p>","DOI":"10.1038\/s41598-021-82984-w","type":"journal-article","created":{"date-parts":[[2021,2,4]],"date-time":"2021-02-04T11:08:10Z","timestamp":1612436890000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Mastoid effusion on temporal bone MRI in patients with Bell\u2019s palsy and Ramsay Hunt syndrome"],"prefix":"10.1038","volume":"11","author":[{"given":"Jin Woo","family":"Choi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiyeon.","family":"Lee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dong-Han","family":"Lee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jung Eun","family":"Shin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chang-Hee","family":"Kim","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,2,4]]},"reference":[{"key":"82984_CR1","doi-asserted-by":"publisher","first-page":"553","DOI":"10.1136\/bmj.329.7465.553","volume":"329","author":"NJ Holland","year":"2004","unstructured":"Holland, N. 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