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The purpose of the study is to investigate the imaging clues for overhanging FN near the oval window on ultra-high-resolution computed tomography (U-HRCT) images.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Between October 2020 and August 2021, images of 325 ears (276 patients) were included in the analysis obtained by an experimental U-HRCT scanner. On standard reformatted images, the morphology of FN was evaluated and its position was quantitatively measured using the following indices: protrusion ratio (PR), protruding angle (A), position of FN (P-FN), distance between FN and stapes (D-S), and distance between FN and anterior and posterior crura of stapes (D-AC and D-PC). According to the FN morphology in imaging, images were divided into overhanging FN group and non-overhanging FN group. Binary univariate logistic regression analysis was used to identify the imaging indices independently associated with overhanging FN.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Overhanging FN was found in 66 ears (20.3%), which manifested as downwards protrusion of either local segment (61 ears, 61\/66) or the entire course near the oval window (5 ears, 5\/66). D-AC [odds ratio: 0.063, 95% CI 0.012\u20130.334, <jats:italic>P<\/jats:italic> = 0.001) and D-PC (odds ratio: 0.008, 95% CI 0.001\u20130.050, <jats:italic>P<\/jats:italic> = 0.000) were identified as independent predictors of FN overhang (area under the curve: 0.828 and 0.865, respectively).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Abnormal morphology of the lower margin of FN, D-AC and D-PC on U-HRCT\nimages provide valuable diagnostic clues for FN overhang.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00405-023-07879-0","type":"journal-article","created":{"date-parts":[[2023,2,27]],"date-time":"2023-02-27T16:03:07Z","timestamp":1677513787000},"page":"3643-3651","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["An exploratory study of imaging diagnostic clues for overhanging facial nerve in ultra-high-resolution CT"],"prefix":"10.1007","volume":"280","author":[{"given":"Zhengyu","family":"Zhang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruowei","family":"Tang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qian","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pengfei","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhenghan","family":"Yang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8190-6469","authenticated-orcid":false,"given":"Zhenchang","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,2,27]]},"reference":[{"key":"7879_CR1","doi-asserted-by":"publisher","first-page":"1897","DOI":"10.1007\/s00405-019-05401-z","volume":"276","author":"IJ Fernandez","year":"2019","unstructured":"Fernandez IJ, Bonali M, Fermi M, Ghirelli M, Villari D, Presutti L (2019) The role of endoscopic stapes surgery in difficult oval window niche anatomy. 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