Fever, pain, swelling and tenderness at the left knee
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Patient's parents did not consent to IV contrast administration, and hence post-contrast sequences were not obtained.
Cystic metaphyseal lesion display low signal in T1 and high signal in T2/STIR images and crosses the physis and form similar cystic lesion at the epiphysis. It is surrounded by extensive marrow edema. Associated cortical distruction and subperiosteal fluid collection is noted. Adjacent popliteal lymph nodes are seen.
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Diagnosis: Brodie abscess with subperiosteal abscess.