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The MRI sequences demonstrate a well-defined lobulated intramedullary cystic lesion of low signal on T1, high signal on PD fat sat/T2 with restricted diffusion centrally, and high signal T1 and low signal PD fat sat/T2 with enhancement peripherally "penumbra sign". Surrounding bone marrow oedema extending to the epiphysis and proximal diaphysis as well as to the surrounding soft tissues.
Normal appearance of the menisci, cruciate and collateral ligaments.
No pathological joint effusion.