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Fig. 2C. —47-year-old man with psoriatic arthritis for 6 months and intraosseous erosion of distal radius. Sagittal spin-echo T1-weighted (TR/TE, 400/10) (C), sagittal spin-echo gadolinium-enhanced fat-saturated T1-weighted (400/9.3, obtained 5 min after injection) (D), and sagittal spin-echo fat-saturated T2-weighted (2,000/80) (E) images show punched-out erosion of anterior articular cortex of distal radius, which has low signal intensity on T1-weighted image (arrow) (C). Lesion enhances with contrast administration on T1-weighted fat-saturated image (D), has high signal on T2-weighted image (E), measures 1.0 x 0.3 x 0.7 cm, and is breaking through cortex into distal radiocarpal joint.