String sign (bones)
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At the time the article was created Behrang Amini had no recorded disclosures.
View Behrang Amini's current disclosuresAt the time the article was last revised Mohammad Taghi Niknejad had no financial relationships to ineligible companies to disclose.
View Mohammad Taghi Niknejad's current disclosures- String sign of parosteal osteosarcomas
The string sign of parosteal osteosarcoma refers to a radiolucent cleavage plane between portions of the tumor and cortex of the affected bone in more than 50% of cases 2, better visualized on CT rather than on a radiograph. The tumor stalk becomes more broad-based with time, obliterating the string sign in later stages.
The string sign can also be seen in myositis ossificans.
References
- 1. Lindell MM Jr, Shirkhoda A, Raymond AK, Murray JA, Harle TS. Parosteal osteosarcoma: radiologic-pathologic correlation with emphasis on CT. AJR Am J Roentgenol. 1987;148(2):323-8. PubMed
- 2. Kumar V, Barwar N, Khan S. Surface Osteosarcomas: Diagnosis, Treatment and Outcome. Indian J Orthop. 2014;48(3):255-61. doi:10.4103/0019-5413.132503 - Pubmed
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