Question 416
{"accessible":false,"alternatives":[{"id":2084,"text":"0%"},{"id":2085,"text":"20%"},{"id":2086,"text":"40%"},{"id":2087,"text":"60%"},{"id":2088,"text":"80%"}],"archived":false,"correctAlternativeId":2085,"explanation":"\u003cp\u003eSonographic findings\u0026nbsp;of a ductal stone are:\u003c/p\u003e\u003cul\u003e\n\u003cli\u003eechogenic rounded focus\u003c/li\u003e\n\u003cli\u003esize ranges between 2 to \u0026gt;20 mm\u003c/li\u003e\n\u003cli\u003eshadowing may be more difficult to elicit than with gallstones within the gallbladder\u003cul\u003e\u003cli\u003e\u003cstrong\u003e~20% of common bile duct stones will not shadow\u003c/strong\u003e\u003c/li\u003e\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003ca href=\"https://radiopaedia.org/articles/twinkle-artifact-1\"\u003etwinkle artefact\u003c/a\u003e\u0026nbsp;may be useful to detect occult stones\u003c/li\u003e\n\u003cli\u003edilated bile duct\u003cul\u003e\n\u003cli\u003e\u0026gt;6 mm + 1 mm per decade above 60 years of age\u003c/li\u003e\n\u003cli\u003e\u0026gt;10 mm post-cholecystectomy\u003c/li\u003e\n\u003cli\u003edilated intrahepatic biliary tree\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003egallstones should increase suspicion, especially if multiple and small\u003c/li\u003e\n\u003c/ul\u003e","id":416,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2404","nextQuestionPath":"/articles/choledocholithiasis/questions/415","relatedArticles":[],"alsoUsedIn":[],"stem":"\u003cp\u003eWhat proportion of stones in choledocholithiasis do not produce shadowing on ultrasound?\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/416"}],"attemptsPercentages":[{"alternativeId":"2085","percentage":63},{"alternativeId":"2084","percentage":10},{"alternativeId":"2086","percentage":16},{"alternativeId":"2087","percentage":7},{"alternativeId":"2088","percentage":4}],"promptToLogin":false,"questionManager":false,"articleId":"choledocholithiasis"}