Question 2082
{"accessible":false,"alternatives":[{"id":10335,"text":"fat halo sign"},{"id":10339,"text":"lead pipe sign"},{"id":10337,"text":"narrowing of rectum"},{"id":10336,"text":"water halo sign"},{"id":10338,"text":"widening of presacral space"}],"archived":false,"correctAlternativeId":10336,"explanation":"\u003cp\u003eThe water halo sign represents acute disease and refers to the intermediate attenuation of the submucosa representing edema.\u003c/p\u003e\u003cp\u003eThe\u0026nbsp;\u003ca href=\"/articles/fat-halo-sign\"\u003efat halo sign\u003c/a\u003e\u0026nbsp;refers to the\u0026nbsp;infiltration of the submucosa with fat and is a feature of chronic bowel involvement.\u003c/p\u003e\u003cp\u003e\u003ca href=\"https://radiopaedia.org/articles/widening-of-presacral-space\"\u003eWidening of presacral space\u003c/a\u003e\u0026nbsp;is a feature of chronic ulcerative colitis due to\u0026nbsp;extramural deposition of fat which\u0026nbsp;leads to the thickening of the perirectal fat and\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/widened-presacral-space?lang=gb\"\u003ewidening of the presacral space\u003c/a\u003e\u0026nbsp;and subsequently rectal narrowing.\u003c/p\u003e\u003cp\u003eThe\u003cstrong\u003e\u0026nbsp;\u003c/strong\u003e\u003ca href=\"/articles/lead-pipe-appearance-of-colon\"\u003elead pipe appearance of the colon\u003c/a\u003e\u0026nbsp;refers to the\u0026nbsp;complete loss of the\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/haustral-markings?lang=gb\"\u003ehaustral markings\u003c/a\u003e\u0026nbsp;in the diseased segment of the colon which appears smooth-walled and cylindrical. It is the classical finding in chronic\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/ulcerative-colitis?lang=gb\"\u003eulcerative colitis\u003c/a\u003e\u0026nbsp;\u003c/p\u003e","id":2082,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2082","nextQuestionPath":null,"relatedArticles":[{"id":1327,"title":"Fat halo sign (inflammatory bowel disease)","link":"/articles/fat-halo-sign-inflammatory-bowel-disease?lang=us"},{"id":6204,"title":"Lead pipe sign (colon)","link":"/articles/lead-pipe-sign-colon?lang=us"}],"alsoUsedIn":[{"id":889,"kind":"Course","title":"2021 Virtual Conference Private Use - page 889","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/889"},{"id":889,"kind":"Course","title":"Radiopaedia 2021 - isoCME - page 889","link":"https://radiopaedia.org/courses/radiopaedia-2021-isocme/pages/889"}],"stem":"\u003cp\u003eAll of the following are features of chronic ulcerative colitis,\u0026nbsp;\u003cstrong\u003eEXCEPT:\u003c/strong\u003e\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/2082"}],"attemptsPercentages":[{"alternativeId":"10336","percentage":51},{"alternativeId":"10339","percentage":4},{"alternativeId":"10338","percentage":7},{"alternativeId":"10335","percentage":26},{"alternativeId":"10337","percentage":12}],"promptToLogin":false,"questionManager":false,"articleId":"widening-of-the-presacral-space-differential"}