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Histological examination revealed a benign cylindroma with margins free of tumour, so that no further treatment was necessary. 8\u2005months after surgery the patient is asymptomatic with normal findings in the ear microscopy examination. Benign cylindroma has a high recurrence rate and can undergo malignant transformation. Therefore, complete surgical removal and close follow-up are of great importance.<\/jats:p>","DOI":"10.1136\/bcr-2015-212035","type":"journal-article","created":{"date-parts":[[2016,1,12]],"date-time":"2016-01-12T01:24:15Z","timestamp":1452561855000},"page":"bcr2015212035","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":7,"title":["Benign cylindroma: a rare differential diagnosis of external ear canal tumour"],"prefix":"10.1136","volume":"2016","author":[{"given":"David","family":"Schwarz","sequence":"first","affiliation":[{"name":"Medical Faculty, Department of Otorhinolaryngology, Head and Neck Surgery, University of Cologne, Cologne, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Uta","family":"Drebber","sequence":"additional","affiliation":[{"name":"Medical Faculty, Department of Pathology, University of Cologne, Cologne, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Monika","family":"Ortmann","sequence":"additional","affiliation":[{"name":"Medical Faculty, Department of Pathology, University of Cologne, Cologne, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andreas","family":"Anagiotos","sequence":"additional","affiliation":[{"name":"Medical Faculty, Department of Otorhinolaryngology, Head and Neck Surgery, University of Cologne, Cologne, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2016,1,11]]},"reference":[{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.1","doi-asserted-by":"publisher","DOI":"10.1288\/00005537-197608000-00007"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.2","doi-asserted-by":"publisher","DOI":"10.1017\/S0022215100120717"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.3","doi-asserted-by":"publisher","DOI":"10.1097\/01.mao.0000188352.97795.8c"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.4","doi-asserted-by":"publisher","DOI":"10.1136\/jcp.2006.041608"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.5","doi-asserted-by":"publisher","DOI":"10.1111\/j.1610-0387.2009.07156_supp.x"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.6","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2133.2006.07142.x"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.7","first-page":"38","article-title":"Sweat gland carcinomas: a comprehensive review","volume":"4","author":"Cruz","year":"1987","journal-title":"Semin Diagn Pathol"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.8","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcms.2012.11.016"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.9","first-page":"673","article-title":"Adenoid cystic carcinoma(cylindroma) of the external auditory canal","volume":"67","author":"Pulec","year":"1963","journal-title":"Trans Am Acad Ophthalmol Otolaryngol"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.10","doi-asserted-by":"publisher","DOI":"10.1111\/crj.12091"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.11","doi-asserted-by":"publisher","DOI":"10.1002\/lary.5540900302"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.12","doi-asserted-by":"publisher","DOI":"10.1097\/00000372-199506000-00008"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.13","doi-asserted-by":"publisher","DOI":"10.4103\/0378-6323.60573"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.14","doi-asserted-by":"publisher","DOI":"10.1016\/j.jaad.2007.12.005"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.15","doi-asserted-by":"crossref","first-page":"326","DOI":"10.1288\/00005537-198303000-00016","article-title":"Tumors arising from the glandular structures of the external auditory canal","volume":"93","author":"Hicks","year":"1983","journal-title":"Laryngoscope"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.16","doi-asserted-by":"publisher","DOI":"10.1586\/era.09.93"},{"key":"2025082723583145000_2016.jan11_1.bcr2015212035.17","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-4632.2007.01689.x"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2015-212035","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T06:58:41Z","timestamp":1756364321000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2015-212035"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2016,1,11]]},"references-count":17,"alternative-id":["10.1136\/bcr-2015-212035"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2015-212035","relation":{},"ISSN":["1757-790X"],"issn-type":[{"type":"electronic","value":"1757-790X"}],"subject":[],"published":{"date-parts":[[2016,1,11]]}}}