Question 1597
{"accessible":true,"alternatives":[{"id":7957,"text":"cord sign"},{"id":7956,"text":"fogging sign"},{"id":7955,"text":"hyperdense vessel sign"},{"id":7953,"text":"spot sign"},{"id":7954,"text":"swirl sign"}],"archived":false,"correctAlternativeId":7954,"explanation":"\u003cp\u003e\u003ca href=\"/articles/swirl-sign\"\u003eSwirl sign\u003c/a\u003e\u0026nbsp;refers to the non-contrast CT appearance of acute extravasation of blood into a hematoma.\u0026nbsp;It represents unclotted fresh blood that is of lower attenuation than the clotted blood that surrounds it.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e","id":1597,"imageUrl":"https://prod-images-static.radiopaedia.org/images/23866660/874e5a224703a626ce364ab980186e_big_gallery.jpeg","imageAttribution":{"kind":"case","rID":46346},"imageAttributionCaseInfo":{"title":"Extradural hematoma - swirl sign","contributor_name":"Henry Knipe","contributor_param":"henryknipe","case_rid":46346,"case_param":"extradural-haematoma-swirl-sign"},"firstQuestionPath":"/questions/2516","nextQuestionPath":"/articles/extradural-haemorrhage/questions/1540","relatedArticles":[{"id":6594,"title":"Swirl sign (intracranial hemorrhage)","link":"/articles/swirl-sign-intracranial-haemorrhage?lang=us"},{"id":19442,"title":"Cord sign (dural sinus thrombosis)","link":"/articles/cord-sign-dural-sinus-thrombosis?lang=us"},{"id":5242,"title":"Hyperdense MCA sign (brain)","link":"/articles/hyperdense-mca-sign-brain-1?lang=us"},{"id":21647,"title":"Fogging phenomenon (cerebral infarct)","link":"/articles/fogging-phenomenon-cerebral-infarct?lang=us"},{"id":24482,"title":"CT angiographic spot sign (intracerebral hemorrhage)","link":"/articles/ct-angiographic-spot-sign-intracerebral-haemorrhage?lang=us"}],"alsoUsedIn":[{"id":242,"kind":"Course","title":"Alfred ICU Teaching 2020","link":"https://radiopaedia.org/courses/alfred-icu-teaching-2020"},{"id":977,"kind":"RestrictedPage","title":"Page 977 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/977"},{"id":976,"kind":"Course","title":"2021 Virtual Conference Private Use - page 976","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/976"},{"id":976,"kind":"Course","title":"2022 Virtual Conference Private Use - page 976","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/976"},{"id":970,"kind":"RestrictedPage","title":"Page 970 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/970"},{"id":955,"kind":"RestrictedPage","title":"Page 955 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/955"},{"id":1,"kind":"LiveSchedule","title":"1","link":"https://radiopaedia.org/admin/live_schedules/1"},{"id":11,"kind":"LiveSchedule","title":"11","link":"https://radiopaedia.org/admin/live_schedules/11"},{"id":593,"kind":"Course","title":"Radiopaedia 2020 - Lectures Only - page 593","link":"https://radiopaedia.org/courses/radiopaedia-2020-exclusive/pages/593"},{"id":593,"kind":"Course","title":"2020 Virtual Conference Private Use - page 593","link":"https://radiopaedia.org/courses/2020-virtual-conference-private-use/pages/593"},{"id":672,"kind":"RestrictedPage","title":"Page 672 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/672"},{"id":673,"kind":"Course","title":"Trauma \u0026 Emergency Radiology Course - page 673","link":"https://radiopaedia.org/courses/medical-mums/pages/673"},{"id":673,"kind":"Course","title":"2020 Virtual Conference Private Use - page 673","link":"https://radiopaedia.org/courses/2020-virtual-conference-private-use/pages/673"},{"id":859,"kind":"Course","title":"2021 Virtual Conference Private Use - page 859","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/859"},{"id":1409,"kind":"Course","title":"Emergency Radiology Course - page 1409","link":"https://radiopaedia.org/courses/emergency-radiology-course-online/pages/1409"},{"id":1409,"kind":"Course","title":"Emergency Radiology Course - Melbourne - page 1409","link":"https://radiopaedia.org/courses/emergency-radiology-course-melbourne-2022/pages/1409"},{"id":1409,"kind":"Course","title":"Emergency Radiology Course - Brisbane - page 1409","link":"https://radiopaedia.org/courses/emergency-radiology-course-brisbane-2022/pages/1409"}],"stem":"\u003cp\u003eA 30-year-old man presents to the emergency department with a history of head injury.\u0026nbsp;CT brain below demonstrates\u0026nbsp;right-sided extradural hematoma. What important sign is shown in the image that represents\u0026nbsp;active bleeding within the hematoma?\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/1597"}],"attemptsPercentages":[{"alternativeId":"7957","percentage":2},{"alternativeId":"7956","percentage":2},{"alternativeId":"7954","percentage":89},{"alternativeId":"7955","percentage":3},{"alternativeId":"7953","percentage":6}],"promptToLogin":false,"questionManager":false,"articleId":"extradural-hemorrhage"}