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The aim of our study was to validate this classification assessing the interobserver agreement and diagnostic test performance in detecting the final histopathology.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>A retrospective study was carried out by reviewing clinical charts, preoperative videos, and final pathologic diagnosis of patients submitted to transoral microsurgery for laryngeal lesions in two Italian referral centers. In each institution, two physicians, independently re-assessed each case applying the ELS classification.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The cohort was composed of 707 patients. The pathologic report showed benign lesions in 208 (29.5%) cases, papillomatosis in 34 (4.8%), squamous intraepithelial neoplasia (SIN) up to carcinoma in situ in 200 (28.2%), and squamous cell carcinoma (SCC) in 265 (37.5%). The interobserver agreement was extremely high in both institutions (\n                      <jats:italic>k<\/jats:italic>\n                      \u2009=\u20090.954,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001 and\n                      <jats:italic>k<\/jats:italic>\n                      \u2009=\u20090.880,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001). Considering the diagnostic performance for identification of at least SIN or SCC, the sensitivity was 0.804 and 0.902, the specificity 0.793 and 0.581, the positive predictive value 0.882 and 0.564, and the negative predictive value 0.678 and 0.908, respectively.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The ELS classification for NBI vascular changes of glottic lesions is a highly reliable tool whose systematic use allows a better diagnostic evaluation of suspicious laryngeal lesions, reliably distinguishing benign ones from those with a diagnosis of papillomatosis, SIN or SCC, thus paving the way towards confirmation of the optical biopsy concept.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00405-021-06723-7","type":"journal-article","created":{"date-parts":[[2021,3,12]],"date-time":"2021-03-12T05:02:37Z","timestamp":1615525357000},"page":"2397-2409","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Validation of the European Laryngological Society classification of glottic vascular changes as seen by narrow band imaging in the optical biopsy setting"],"prefix":"10.1007","volume":"278","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5357-5348","authenticated-orcid":false,"given":"Francesco","family":"Missale","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2407-4031","authenticated-orcid":false,"given":"Stefano","family":"Taboni","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0919-971X","authenticated-orcid":false,"given":"Andrea Luigi Camillo","family":"Carobbio","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1533-8832","authenticated-orcid":false,"given":"Francesco","family":"Mazzola","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giulia","family":"Berretti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Iandelli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marco","family":"Fragale","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesco","family":"Mora","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alberto","family":"Paderno","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesca","family":"Del Bon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giampiero","family":"Parrinello","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1008-7333","authenticated-orcid":false,"given":"Alberto","family":"Deganello","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2391-9357","authenticated-orcid":false,"given":"Cesare","family":"Piazza","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giorgio","family":"Peretti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,3,12]]},"reference":[{"key":"6723_CR1","doi-asserted-by":"publisher","first-page":"589","DOI":"10.1177\/0194599816685701","volume":"156","author":"C Sun","year":"2017","unstructured":"Sun C, Han X, Li X et al (2017) Diagnostic performance of narrow band imaging for laryngeal cancer: a systematic review and meta-analysis. 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