[Myositis ossificans circumscripta: the contribution of imaging]

Area of Science:

• Radiology
• Orthopedic Imaging
• Diagnostic Imaging

Background:

• Myositis ossificans circumscripta (MOC) is a benign bone-forming tumor.
• Accurate diagnosis relies on characteristic imaging findings.
• Differentiating MOC from malignant lesions is crucial.

Purpose of the Study:

• To illustrate the specific and nonspecific imaging features of MOC.
• To evaluate the utility of various imaging modalities in MOC diagnosis and management.
• To compare standard radiography, sonography, CT, MRI, and bone scintigraphy for MOC.

Main Methods:

• Retrospective analysis of eight patients with MOC.
• Utilized standard radiography, sonography, CT, MRI, and bone scintigraphy.
• Correlated imaging findings with clinical and pathological data.

Main Results:

• Standard radiography and sonography showed well-defined calcified masses in 75% of cases.
• CT demonstrated calcified masses with clear borders or peripheral calcifications suggestive of MOC.
• MRI was nonspecific; bone scintigraphy showed hyperfixation.

Conclusions:

• Standard radiography and sonography are useful for detecting MOC calcifications and their relationship to bone.
• CT precisely localizes lesions for surgical planning.
• MRI is sensitive for early detection but requires biopsy for definitive diagnosis due to nonspecificity.