Question 1784
{"accessible":true,"alternatives":[{"id":8859,"text":"external auditory canal cholesteatoma"},{"id":8860,"text":"external auditory canal exostosis"},{"id":8861,"text":"external auditory canal osteoma"},{"id":8862,"text":"keratosis obturans"},{"id":8863,"text":"otitis externa"}],"archived":false,"correctAlternativeId":8861,"explanation":"\u003cp\u003eThere is a pedunculated bony mass arising from the posterior wall of the left external auditory canal, almost obliterating its lumen. The middle ear and ossicular chain were normal.\u0026nbsp;The CT features of a unilateral focal, pedunculated bony overgrowth is most consistent with an\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/external-auditory-canal-osteoma?lang=gb\"\u003eosteoma of the external auditory canal\u003c/a\u003e.\u003c/p\u003e\u003cp\u003eOn imaging, the main differential diagnosis is an\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/external-auditory-canal-exostoses?lang=gb\"\u003eexostosis of the\u0026nbsp;external auditory canal\u0026nbsp;\u003c/a\u003e(surfer's ear) which usually is bilateral with broad-based bony overgrowth.\u003c/p\u003e\u003cp\u003e\u0026nbsp;\u003c/p\u003e\u003cp\u003e\u003c/p\u003e","id":1784,"imageUrl":"https://prod-images-static.radiopaedia.org/multiple_choice_questions/278/external-auditory-canal-osteoma-5_big_gallery.jpeg","imageAttribution":{"kind":"case","rID":82793},"imageAttributionCaseInfo":{"title":"External auditory canal osteoma","contributor_name":"Ammar Haouimi","contributor_param":"ammar-haouimi","case_rid":82793,"case_param":"external-auditory-canal-osteoma-5"},"firstQuestionPath":"/questions/1784","nextQuestionPath":null,"relatedArticles":[{"id":37976,"title":"Otitis externa","link":"/articles/otitis-externa?lang=us"},{"id":4054,"title":"External auditory canal exostoses","link":"/articles/external-auditory-canal-exostoses?lang=us"},{"id":46947,"title":"External auditory canal osteoma","link":"/articles/external-auditory-canal-osteoma?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eA 15-year-old boy, presented with a history of a left hearing loss. A hard mass was noted within the EAC on the ENT exam. What is the most likely diagnosis shown on this\u0026nbsp;selected CT image (bone window)?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/1784"}],"attemptsPercentages":[{"alternativeId":"8862","percentage":36},{"alternativeId":"8859","percentage":15},{"alternativeId":"8863","percentage":3},{"alternativeId":"8860","percentage":14},{"alternativeId":"8861","percentage":31}],"promptToLogin":false,"questionManager":false,"articleId":"keratosis-obturans"}