Question 1814
{"accessible":true,"alternatives":[{"id":9011,"text":"anterior vertebral line"},{"id":9012,"text":"lower cervical prevertebral thickness"},{"id":9013,"text":"posterior vertebral line"},{"id":9014,"text":"spinolaminar line"},{"id":9015,"text":"upper cervical prevertebral thickness"}],"archived":false,"correctAlternativeId":9015,"explanation":"\u003cp\u003eThis patient has a Jefferson fracture with abnormally thickened\u0026nbsp;upper cervical prevertebral soft-tissues due to edema or hematoma (far greater than the allowable 7 mm). The lower cervical prevertebral thickness is allowed to be up to 22 mm in thickness and so is probably normal in this case. The vertebral lines and spinolaminar lines are continuous and smooth.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e","id":1814,"imageUrl":"https://prod-images-static.radiopaedia.org/multiple_choice_questions/300/jefferson-fracture-4_big_gallery.jpeg","imageAttribution":{"kind":"case","rID":31792},"imageAttributionCaseInfo":{"title":"Jefferson fracture","contributor_name":"Andrew Dixon","contributor_param":"dixona","case_rid":31792,"case_param":"jefferson-fracture-4"},"firstQuestionPath":"/questions/1816","nextQuestionPath":"/articles/cervical-spine-alignment/questions/1812","relatedArticles":[],"alsoUsedIn":[{"id":804,"kind":"Course","title":"X-ray Interpretation: Cervical Spine - page 804","link":"https://radiopaedia.org/courses/x-ray-interpretation-cervical-spine/pages/804"},{"id":804,"kind":"Course","title":"Emergency Radiology Course - Melbourne - page 804","link":"https://radiopaedia.org/courses/emergency-radiology-course-melbourne-2022/pages/804"},{"id":804,"kind":"Course","title":"Emergency Radiology Course - Brisbane - page 804","link":"https://radiopaedia.org/courses/emergency-radiology-course-brisbane-2022/pages/804"}],"stem":"\u003cp\u003eWhich of the following lines or thicknesses is abnormal on this radiograph?\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/1814"}],"attemptsPercentages":[{"alternativeId":"9013","percentage":4},{"alternativeId":"9012","percentage":4},{"alternativeId":"9011","percentage":13},{"alternativeId":"9015","percentage":72},{"alternativeId":"9014","percentage":7}],"promptToLogin":false,"questionManager":false,"articleId":"cervical-spine-alignment"}