Question 428
{"accessible":false,"alternatives":[{"id":2147,"text":"conventional osteosarcoma"},{"id":2148,"text":"extraskeletal osteosarcoma"},{"id":2149,"text":"parosteal osteosarcoma"},{"id":2150,"text":"periosteal osetosarcoma"},{"id":2151,"text":"telangiectatic osteosarcoma"}],"archived":false,"correctAlternativeId":2149,"explanation":"\u003cp\u003eThe\u0026nbsp;string sign of parosteal osteosarcoma\u0026nbsp;refers to the plain radiographic and CT appearance a radiolucent cleavage plane between portions of the tumor and cortex of the affected bone.\u0026nbsp;The tumor stalk becomes more broad-based with time, obliterating the string sign in later stages.\u003c/p\u003e\u003cp\u003eThe string sign can also be seen in\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/myositis-ossificans-1\"\u003emyositis ossificans\u003c/a\u003e.\u003c/p\u003e","id":428,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2233","nextQuestionPath":"/articles/osteosarcoma/questions/427","relatedArticles":[{"id":27393,"title":"Extraskeletal osteosarcoma","link":"/articles/extraskeletal-osteosarcoma?lang=us"},{"id":10830,"title":"Telangiectatic osteosarcoma","link":"/articles/telangiectatic-osteosarcoma?lang=us"},{"id":14577,"title":"Periosteal osteosarcoma","link":"/articles/periosteal-osteosarcoma?lang=us"},{"id":1847,"title":"Parosteal osteosarcoma","link":"/articles/parosteal-osteosarcoma-1?lang=us"}],"alsoUsedIn":[{"id":1119,"kind":"RestrictedPage","title":"Page 1119 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/1119"},{"id":2086,"kind":"Course","title":"2024 Virtual Conference Private Use - page 2086","link":"https://radiopaedia.org/courses/2024-virtual-conference-private-use/pages/2086"},{"id":2086,"kind":"Course","title":"X-ray Interpretation: Bone Lesions Peer Review - page 2086","link":"https://radiopaedia.org/courses/x-ray-interpretation-bone-lesions-peer-review/pages/2086"},{"id":2086,"kind":"Course","title":"X-ray Interpretation: Bone Lesions - page 2086","link":"https://radiopaedia.org/courses/x-ray-interpretation-bone-lesions/pages/2086"}],"stem":"\u003cp\u003eThe string sign is seen in which bone tumor?\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/428"}],"attemptsPercentages":[{"alternativeId":"2147","percentage":3},{"alternativeId":"2150","percentage":13},{"alternativeId":"2149","percentage":70},{"alternativeId":"2151","percentage":10},{"alternativeId":"2148","percentage":3}],"promptToLogin":false,"questionManager":false,"articleId":"osteosarcoma"}