Question 516
{"accessible":false,"alternatives":[{"id":2588,"text":"gyriform enhancement of cortex"},{"id":2589,"text":"hyperdense artery sign"},{"id":2590,"text":"hypoattenuation of white matter"},{"id":2591,"text":"loss of grey white matter differentiation"},{"id":2592,"text":"regional swelling"}],"archived":false,"correctAlternativeId":2589,"explanation":"\u003cp\u003eThe\u0026nbsp;hyperdense artery sign\u0026nbsp;refers to focal increased density of an intracranial artery\u0026nbsp;on CT (typically MCA) and is direct visualization of thromboembolic material within the lumen. It is thus the earliest visible sign of\u0026nbsp;infarction\u0026nbsp;seen immediately at the time of embolism.\u0026nbsp;\u003c/p\u003e\u003cp\u003eThe hyperdensity of the arterial content is due to the thrombus having previously formed and contracted, usually within the heart or carotid bulb, prior to embolizing and occluding the artery.\u003c/p\u003e","id":516,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1953","nextQuestionPath":"/articles/middle-cerebral-artery-mca-infarct/questions/469","relatedArticles":[{"id":13437,"title":"Ischemic stroke","link":"/articles/ischaemic-stroke?lang=us"},{"id":5242,"title":"Hyperdense MCA sign (brain)","link":"/articles/hyperdense-mca-sign-brain-1?lang=us"},{"id":184109,"title":"Hyperdense vessel sign","link":"/articles/hyperdense-vessel-sign?lang=us"}],"alsoUsedIn":[{"id":178,"kind":"Course","title":"Emergency Imaging in Stroke","link":"https://radiopaedia.org/courses/emergency-imaging-in-stroke"},{"id":242,"kind":"Course","title":"Alfred ICU Teaching 2020","link":"https://radiopaedia.org/courses/alfred-icu-teaching-2020"},{"id":581,"kind":"Course","title":"Radiopaedia 2020 - Lectures Only - page 581","link":"https://radiopaedia.org/courses/radiopaedia-2020-exclusive/pages/581"},{"id":581,"kind":"Course","title":"2020 Virtual Conference Private Use - page 581","link":"https://radiopaedia.org/courses/2020-virtual-conference-private-use/pages/581"},{"id":671,"kind":"Course","title":"Trauma \u0026 Emergency Radiology Course - page 671","link":"https://radiopaedia.org/courses/medical-mums/pages/671"},{"id":671,"kind":"Course","title":"2020 Virtual Conference Private Use - page 671","link":"https://radiopaedia.org/courses/2020-virtual-conference-private-use/pages/671"},{"id":766,"kind":"Course","title":"Stroke Learning Pathway - page 766","link":"https://radiopaedia.org/courses/stroke-learning-pathway/pages/766"},{"id":928,"kind":"Course","title":"2021 Virtual Conference Private Use - page 928","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/928"},{"id":928,"kind":"Course","title":"CT \u0026 MRI Lectures - page 928","link":"https://radiopaedia.org/courses/ct-mri-lectures/pages/928"},{"id":1192,"kind":"Course","title":"Neuroradiology Lectures - page 1192","link":"https://radiopaedia.org/courses/neuroradiology-lectures/pages/1192"},{"id":1192,"kind":"Course","title":"New test course - page 1192","link":"https://radiopaedia.org/courses/new-test-course/pages/1192"},{"id":1416,"kind":"Course","title":"Emergency Radiology Course - page 1416","link":"https://radiopaedia.org/courses/emergency-radiology-course-online/pages/1416"},{"id":1416,"kind":"Course","title":"Emergency Radiology Course - Melbourne - page 1416","link":"https://radiopaedia.org/courses/emergency-radiology-course-melbourne-2022/pages/1416"},{"id":1416,"kind":"Course","title":"Emergency Radiology Course - Brisbane - page 1416","link":"https://radiopaedia.org/courses/emergency-radiology-course-brisbane-2022/pages/1416"},{"id":1416,"kind":"Course","title":"Content Previews - page 1416","link":"https://radiopaedia.org/courses/previews/pages/1416"},{"id":2103,"kind":"Course","title":"Stroke Learning Pathway - peer review - page 2103","link":"https://radiopaedia.org/courses/stroke-learning-pathway-peer-review/pages/2103"}],"stem":"\u003cp\u003eWhich of the following is the earliest visible\u0026nbsp;CT finding of likely ischemic stroke?\u0026nbsp;\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/516"}],"attemptsPercentages":[{"alternativeId":"2592","percentage":3},{"alternativeId":"2588","percentage":1},{"alternativeId":"2591","percentage":35},{"alternativeId":"2590","percentage":3},{"alternativeId":"2589","percentage":58}],"promptToLogin":false,"questionManager":false,"articleId":"middle-cerebral-artery-mca-infarct"}