Figure 1.

Conventional radiography (CR) and magnetic resonance imaging (MRI) (coronal/axial T1-weighted fat-suppressed images) of the right hand. Both CR (a) and MRI (b,c) show severe osteoarthritis with osteophytes (white arrowheads) and central collapse of the joint plate in the 2nd distal interphalangeal (DIP) joint. Both MRI and CR show severe joint space narrowing in the 3rd DIP joint. The osteophytes are more easily seen on CR, whereas MRI shows the collateral ligaments (black arrowheads). CR shows a cyst-like lesion (white arrow), which on MRI seems to be an erosion (that is, a cortical break in the axial plane).