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Histological specimen showed epithelioid and spindle cells with focal intense pigmentations and immunohistochemical features compatible with primary melanotic sinonasal mucosal melanoma (SNM). As melanotic SNM shows MRI pathognomonic high non-enhanced T1-w SI, this case underlines the crucial role of MRI not only in assessing the local tumour extension\/recurrence but also in increasing the diagnostic confidence of detecting melanotic SNM. Thus, MRI should be always performed in case of clinical\u2013endoscopic suspicion of SNM.<\/jats:p>","DOI":"10.1136\/bcr-2019-229790","type":"journal-article","created":{"date-parts":[[2019,7,23]],"date-time":"2019-07-23T05:49:11Z","timestamp":1563860951000},"page":"e229790","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":11,"title":["Magnetic resonance features of sinonasal melanotic mucosal melanoma"],"prefix":"10.1136","volume":"12","author":[{"given":"Cosimo","family":"Nardi","sequence":"first","affiliation":[{"name":"Department of Experimental and Clinical Biomedical Sciences, Radiodiagnostic Unit n. 2, University of Florence \u2013 Azienda Ospedaliero-Universitaria Careggi, Florence, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4984-3143","authenticated-orcid":false,"given":"Chiara","family":"Vignoli","sequence":"additional","affiliation":[{"name":"Department of Experimental and Clinical Biomedical Sciences, Radiodiagnostic Unit n. 2, University of Florence \u2013 Azienda Ospedaliero-Universitaria Careggi, Florence, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0823-8131","authenticated-orcid":false,"given":"Margherita","family":"Vannucchi","sequence":"additional","affiliation":[{"name":"Department of Surgery and Translational Medicine, Division of Pathological Anatomy, University of Florence \u2013 Azienda Ospedaliero-Universitaria Careggi, Florence, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4589-7109","authenticated-orcid":false,"given":"Michele","family":"Pietragalla","sequence":"additional","affiliation":[{"name":"Department of Experimental and Clinical Biomedical Sciences, Radiodiagnostic Unit n. 2, University of Florence \u2013 Azienda Ospedaliero-Universitaria Careggi, Florence, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2019,7,22]]},"reference":[{"key":"2025082702515698000_12.7.e229790.1","doi-asserted-by":"publisher","DOI":"10.1017\/S0022215110002720"},{"key":"2025082702515698000_12.7.e229790.2","doi-asserted-by":"publisher","DOI":"10.1016\/j.suc.2014.07.013"},{"key":"2025082702515698000_12.7.e229790.3","doi-asserted-by":"crossref","first-page":"152","DOI":"10.1102\/1470-7330.2012.0015","article-title":"Imaging of sinonasal tumours","volume":"12","author":"Eggesb\u00f8","year":"2012","journal-title":"Cancer Imaging"},{"key":"2025082702515698000_12.7.e229790.4","doi-asserted-by":"crossref","first-page":"365","DOI":"10.1016\/j.anorl.2013.11.004","article-title":"Mucosal melanoma of the nasal cavity and paranasal sinuses","volume":"131","author":"Gilain","year":"2014","journal-title":"Eur Ann Otorhinolaryngol Head Neck Dis"},{"key":"2025082702515698000_12.7.e229790.5","doi-asserted-by":"crossref","first-page":"236","DOI":"10.1007\/s12105-014-0570-4","article-title":"Primary mucosal melanoma of the sinonasal tract: a clinicopathologic and immunohistochemical study of thirty-two cases","volume":"9","author":"Mochel","year":"2015","journal-title":"Head Neck Pathol"},{"key":"2025082702515698000_12.7.e229790.6","first-page":"1","article-title":"Sinonasal Melanoma: A Case Report and Literature Review","volume":"2017","author":"Alves","year":"2017","journal-title":"Case Rep Oncol Med"},{"key":"2025082702515698000_12.7.e229790.7","doi-asserted-by":"crossref","first-page":"593","DOI":"10.2217\/iim.10.51","article-title":"Using magnetic resonance for the imaging of dural invasion by head and neck tumors","volume":"2","author":"Borges","year":"2010","journal-title":"Imaging Med"},{"key":"2025082702515698000_12.7.e229790.8","doi-asserted-by":"crossref","unstructured":"Turri-Zanoni M , Lambertoni A , Margherini S , et al . 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