Fast Five Quiz: How Much Do You Know About Psoriatic Arthritis?

Herbert S. Diamond, MD


June 13, 2016

Radiography shows a combination of erosion (unlike in ankylosing spondylosis) and bone growth (unlike in rheumatoid arthritis) in affected joints. The following radiographic abnormalities are suggestive of psoriatic arthritis:

  • Arthritis mutilans (ie, "pencil-in-cup" deformities)

  • Joint-space narrowing in the interphalangeal joints, possibly with ankylosis

  • Increased joint space in the interphalangeal joints as a result of destruction

  • Fluffy periostitis

  • Bilateral, asymmetrical, fusiform soft-tissue swelling

  • Unilateral or symmetrical sacroiliitis

  • Large, nonmarginal, unilateral, asymmetrical syndesmophytes (intervertebral bony bridges, seen in the image below) in the cervical, thoracic, and lumbar spine, often sparing some of the segments

For more on the workup of psoriatic arthritis, read here.


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