Juxtacortical Circumscribed Myositis Ossificans: Evolution and Radiographic Features'

TLDR: This important roentgen sign points up the lack of intimate connection between the lesion and adjacent bone which differentiates myositis ossificans from juxtacortical osteosarcoma.

Abstract: Juxtacortical myositis, a localized circumscribed type of myositis ossificans in close apposition to bone, was seen in 4 patients. A history of local injury, most often related to trauma, was demonstrated in 3. The evolution of the focus of myositis ossificans can be correlated with the time lapse following trauma. Radiographic evolution parallels the histologic pattern of maturation. A “radiolucent zone” of soft tissue separates the lesion from the underlying periosteal reaction and cortex. This important roentgen sign points up the lack of intimate connection between the lesion and adjacent bone which differentiates myositis ossificans from juxtacortical osteosarcoma.