Figure 4a:

MR images in a 13-year-old girl with stable juvenile osteochondritis dissecans (JOCD) lesion of medial femoral condyle. (a) Sagittal proton density–weighted fast spin-echo and (b) sagittal fat-suppressed T2-weighted fast spin-echo images of knee show JOCD lesion on medial femoral condyle (arrows) with surrounding T2-weighted non–fluid-like high-signal rim (arrowhead). (c) Corresponding T2 color map shows diffuse increased T2 color map signal within JOCD lesion (arrow). The cartilage overlying the JOCD lesion has normal T2 color map signal (arrowheads in c).