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Fig. 4E. —41-year-old man with seronegative rheumatoid arthritis and intraosseous lesion of distal phalanx of fifth finger. Sagittal spin-echo T1-weighted (TR/TE, 414/10) (C), sagittal spin-echo gadolinium-enhanced fat-saturated T1-weighted (630/9.3, obtained 5 min after injection) (D), and sagittal spin-echo fat-saturated T2-weighted (2,799/80) (E) images show 1.0 x 0.5 x 0.7 cm lesion in proximal aspect of distal phalanx of fifth digit. Lesion has low signal intensity on T1-weighted image (C), enhances with contrast administration (D), and has high signal intensity on T2-weighted image (E). Note synovitis of proximal interphalangeal joint.