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Figure 1. An anteroposterior radiograph of the great toes of a 41-year-old man with psoriatic arthritis shows that the toe on the left is normal. On the right there is soft-tissue swelling that is not confined to the distribution of the joint. The interphalangeal joint space is narrowed (asterisk), and there are subchondral cysts (arrowhead) and marginal erosions (thin arrows). There is new periosteal bone formation (thick arrows) and endosteal bone formation (the so-called ivory phalanx). These findings and the asymmetric distribution are typical of psoriatic arthritis.
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