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(a) Axial reformatted image obtained after MRI T1-weighted turbo spin echo sequences. Cartilage defect of the femur (white arrow) can only be discovered with difficulty as a hypointense area. (b) Axial reformatted image obtained after Proton-density weighted (PDW) sequence showing the defect of cartilage tissue as a sharp margined hyperintense area of the femur (white arrow).
