Patient's parents did not consent to IV contrast administration, and hence post-contrast sequences were not obtained.
Cystic metaphyseal lesion display low signal on T1 and high signal on T2/STIR images and crosses the physis to form a similar cystic lesion at the epiphysis. It is surrounded by extensive marrow edema. Associated posterior cortical destruction and subperiosteal fluid collection are noted. Adjacent popliteal lymph nodes are seen.