Purpose: This study compares the value of sonography and computed tomography (CT) in assessing fluid-fluid levels (FFLs) in aneurysmal bone cysts (ABCs) in children.
Methods: Five children 4-13 years old with ABC in pubis, humerus, fibula, calcaneus, and ilium-ischium were studied between January 1995 and December 1996. Plain radiography, sonography, and CT were performed.
Results: FFLs were visualized equally or better with sonography than with CT.
Conclusions: We propose that sonography be used to complement plain radiography in the prebiopsy assessment of expansile bone lesions with cortical bone thinning because the presence of FFLs is characteristic of ABC. CT and/or magnetic resonance imaging could be used in indeterminate cases and in complex anatomic locations. Such an approach would save time and reduce costs and discomfort to children.