MRI
Coronal T1
Sagittal PD fat sat
Coronal PD fat sat
Axial PD fat sat
Sagittal T1
Sagittal T1 fat sat
Sagittal T1 C+ fat sat
Axial T1 C+ fat sat
Coronal T1 C+ fat sat
Extensive serpiginous intramedullary lesions involving the distal femur, proximal tibia and patella. They appear isointense to hypointense to the bone marrow on T1 centrally and hypointense peripherally. On PD fat sat sequences, there is a hyperintense inner ring (granulation tissue) with a hypointense outer ring of sclerosis "double-line sign" with peripheral rim enhancement on postcontrast sequences.