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Fig. 1D. —48-year-old woman with rheumatoid arthritis since childhood and intraosseous lesion of distal radius. Radiographs failed to show intraosseous lesion of distal radius even 25 months after MRI. Sagittal spin-echo T1-weighted (TR/TE, 400/10) (D), sagittal spin-echo fat-saturated gadolinium-enhanced T1-weighted (400/9.3, obtained 9 min after injection) (E), and sagittal spin-echo T2-weighted with fat saturation (2,500/80) (F) images show 1.0 x 0.5 x 0.4 cm lesion in distal radius with low signal intensity on T1-weighted images (D). Lesion enhances with contrast administration on T1-weighted fat-saturated image (E) and has bright signal on T2-weighted image (F). There is no cortical break, and lesion is remote from nearest joint. Note bone marrow edema of lunate bone.