String sign (bones)
Citation, DOI & article data
The string sign of parosteal osteosarcoma refers to the plain radiographic/CT appearance of a radiolucent cleavage plane between portions of the tumor and cortex of the affected bone. 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.
- 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