Fig. 10

Ganglion cyst at the lateral margin of the right knee in a 6-year-old boy. An AP radiograph of the right knee a reveals slight soft-tissue fullness along the lateral aspect of the knee (marked by star). This corresponded to the site of fluctuant mass noted on palpation. No associated adjacent bony defects/erosive changes are observed. Axial b and coronal c fat-suppressed T2-weighted MR images show a lobulated, deformable, cystic mass adjacent to and wrapping around the lateral distal femoral metaphysis (arrows). A sagittal proton density image d reveals high signal within the fluid (due to high mucopolysaccharide content); thin rim enhancement was noted with contrast (arrow) e